Lovely cars. If you're out of blank checks, buy the nicest, late 80's 911SC you can afford and "back-date it with earlier sheet metal and bits. You'll get the good rustproofing from the late cars as well as myriad evolutionary upgrades and a bigger better engine.
We're about to build one, and I for one can't wait to get started. Here's Magnus looking over the real thing at Amelia as well as a link to some righteous inspiration.
http://www.sportscardigest.com/ameli...911-race-cars/