Engine builder questions

Here's something I put together for ya 278 0.030" over, 9.5:1CR, 650 and Airgap, Headers, Heads ported out to 1wild&crazyguys flow numbers with 1.78-1.50 valves, Comp Cams Hydraulic roller 20-746-9 with 1.6 roller rockers. Probably could get away with cast domes with some milling and most your money would be spent on valve train. 350hp@5500 380@4000