The 572 isn't exactly cost effective if you're on a buget. The basic engine, with a Demon carb and ignition, runs around $13500 from Summit and Jegs. GM might be a little less, but won't include the carb. That's for the 620 horse version. For the 572R (720 horse) you're looking at around $18000+. That's just for the engine. Stacey David has one (the first one actually) in Copperhead, backed up with a seriosly modded TH400 w/Gear Vendors o/d. It also has a 300 horse nitrous system. So far, he hasn't been able to get it to hook up. And that's without the N2O.
The Cad engine would be a good one to start with, especially if you're looking for big displacement, but be prepared to do some mods to it to get the higher rpm out of it. Namely in the intake side.
While the Cad would be unusual, a BBC would be easier/cheaper to build up. They also breath better and have a better aftermarket support.
