5.7 is VVT, 6.1 is not. 5.7 has a composite intake, 6.1 is aluminum. 5.7 heads have a smaller combustion chamber so if you port & polish them & jam em on a 6.1, you get higher compression (11.5:1 in my Polara) but still very street/pump gas friendly.I may research that. That would make for a pretty cool build. Is that a way better starting point than a 5.7? As far as aftermarket goes?
Tons of aftermarket for both though.