I would get the cheapest car to get into this platform, I think a c5 frc with a blown engine should be way under $10k. And if you end up with over $10k to blow on a LS engine setup, go crazy. 600whp NA is possible. 1500whp boosted is highly feasible. Iron blocks are super cheap. No one ever talks about aluminum lungs. 'cause aluminum sucks. $#@! aluminum.

What I mean to say is, the reason you go chevy is for cheap power parts. It's not like you're going to keep stock engine components, so go cheap for initial investment, blow real cash underhood.