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As a co-owner of a Euro Specced `75 Dino 308GT4 I think you are typical of an armchair expert/potential purchaser. I`ve had a quick scan of those pages and really there is nothing of consequence to concern yourself about. Production changes are made to most vehicles during their production life, many to reduce manufacturer`s cost, some to improve the odd minor design weakness as they do their best to minimise warranty issues but those days are well gone as the cars are OLD, hardly in the first flush of youth.
They are a very simple car - you appear to be an Alfa owner from your title - they are in effect just a big Alfa using the same design techniques etc and if you do any work yourself on your cars will readily relate to them. They are simple and robust but because they are old are the sum total of all the maintenance and care given to them by previous owners.
Service history and a corrosion free structure are key plus they have to have been used, not left to decorate somebody`s garage. Higher mileage ones, with service history are better. In use they are great, the worst aspect is getting in and out of them.(For a tall overweight 68 year old anyway). No electronics (we have the twin distributors 4 sets of points engine), the pure sound of 4 Webers - one throat per cylinder and purely mechanical suspension and brakes make for a reliable, fun car.

 

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Bowing to Robert`s better knowledge of the US versions but however knowing the Euro specs I think I would always go for the Euro specced cars if you can, more power, and no emissions air pumps, extra ugly lights on the sides, or warning lights on the dash etc etc. Lighter cars are faster and Euro cars are lighter, plus engines more powerful. The car is simpler not having the emissions gear, warning lights those extra lights etc which has to be better.

 

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Duetto66, my term "armchair expert" refers to those who gather lots of information, some often provided by those with little actual knowledge themselves. Some of these "facts" are inconsequential or are so rare in the real world that should not even be considered. It can present a quite false impression of a model and confuse people, often putting them off a purchase. These armchair experts are often people who have never held a spanner in their life and concentrate on the information they have gathered so much - being particularly susceptible to negative information that they end up never making a purchase.
You are obviously like us (my son and I) and own several cars , including other Ferraris. I used to own a European workshop here in Christchurch New Zealand, and we do all work on our own cars, including fabrication of body panels and all mechanical. Engine tuning is my particular interest though and if I`m honest old Alfas are our real favourites.
Again though I would reiterate how good the GT4`s are if you have winding roads. We are into originality and have new OE size & type Michelins fitted and the car is incredibly agile and communicative. In Euro form with 255hp if the gearbox is used as it should be the car is still satisfyingly quick as a cross country steed and an enjoyable, very reliable drive.

 

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I wouldn`t bother with the wider bigger diameter rim tyres. Ours runs standard Dino mags and new Michelin tyres as fitted originally. We bought them from Longstone Tyres in UK and if you consider them dear in the US you`re actually getting off lightly compared to what we paid in NZ. We see the car as a timepiece frozen in time rather like a balance sheet is and accept it is an old car and that younger Ferraris go faster and are able to corner faster, brake in less distance etc etc.
On the tyres we have the car is beautifully balanced with excellent chassis communication and at speeds way above the speed limit (and on the track) the car drifts very predictably but is easily controlled with throttle and steering. On our last event we were well able to keep up with a Boxer through windy bits (it held us back) and was not really that much slower on the straights despite both of us trying. We also run the 4 sets of points which when set up properly with the use the car gets have proven to be extremely reliable. It is my thinking being they can be fixed by the side of the road if there is an issue. Having the twin distibutors also gives insurance to the car always being mobile if the worst happens. Try repairing electronic components by the side of the road. On our touring events it is always the electronic components that fail when someones car breaks down whereas the old analog cars just keep on going.