And speaking of a decent deal on a 308 GT4, here's one for about $17k.
http://adcache.collectorcartraderonline.com/10/9/0/80275890.htm
The only things are its a '75 (not a '74 as listed) and the rims are aftermarket.
The '74's were never sold in the US market (32 of the 76 308 GT4s produced that year were privately imported into the US) and therefore didn't have the federalized bumpers nor the recessed sidemarker lights that started in '75 for the US only market. The stock rims would have been cast magnesium with Dino center caps for the '74 also, switching over to Ferrari center caps in '75. I believe the '76+ 308 GT4s used the cast aluminum rims used on the 308 GTB that came out in '76. Now if you want a light race car, find a '76 GTB. It was the first production year of the 308 GTB and all the bodies were molded fiberglass for ultralight weight (and a quick production cycle from concept to showroom). In '77 they introduced the steel shell for the GTB and introduced the GTS (targa top). These two years were some of the most powerful of the 308s as in '78/79 Ferrari introduced their first fuel injection system and the HP dropped.
Ok, sorry for the Ferrari history lesson on a Porsche board. :P A great car is a great car, even if its from Italy.