You could try some other classic Ferraris. The 330GTC would not be a problem for you, I think. I'm 6"1, 180 pounds, fairly long legs and I don't have the seat fully back. The 365BB could also work, with Boxer's caveat. If you're 6'4 the head room will be only just enough I would venture.
Thanks for your suggestions. I really (like most others) wanted a Daytona - first choice. After that, I love the 250 range, especially the Lusso - but I'm afraid I'll do no better there...
I am looking for a Swan Song, investment-grade Ferrari. When I got my first Ferrari (a 308GTS QV) I thought it would be the only one and am surprised that I've kept in the game this long, but I do have the fever (no 'cowbell' references, please!). I barely fit in the 308 (other than a little head room) but, as Vitalone noted, I was so happy to be in the darned thing that I didn't care. Now I'm driving a 430 that is huge by comparison and in the absolute. When I was at the dealer on Saturday I was shocked to see my car sitting next to a Testarossa - the TR was tiny - I should have grabbed a photo of that!
Anyway, I am going to further investigate the options on the Daytona before I give up on that model. Others have mentioned lowering the seat, taking out the rails, smaller steering wheel, extenders, et cetera. And, provided that any or some of these could solve the problem in a way that would provide a modicum of pleasure without permanently changing the car (and its value), I will most likely proceed along those lines...