I read about this conversion and your on the ball. This is what I read, "The V8 was a close relative of the 268ci (4.4 litre) V12 which powered the 365 GTB, sharing it's stroke and bore."Tillman said:The conversion used a dual cam 365 motor (not the 4 cam Daytona motor) and the stock 308 transaxle, along with a lot of machine work. There were plans sold for a while that explained how to do it. Somewhere around here I have one of those books that reprints a collection of magazine articles, and they had a review of the car. As I recall, more torque than stock, not so rev-happy as stock, a faster car.
AtlantaMan over at FerrariChat has a V12 308, although I think it's apart right now. JRV at Ferrari-Talk has also done the conversion and has some poor pics on his website.
Hope that helps.