Greg...Modify your 5.7 heads. Glen Knowlton, Joe Mondello, both men, May they RIP, agreed my hand ported G3 Hemi heads were kick azz when I welded the 5.7 up the quensh pads and installed bigger valves. Port velocity/air speed was in the 345 range at mid lift number's. Exh:int ratio's in the mid 70's. You won't see those numbers at mid to high lift with 6.1, Eagle or Apache heads.