Small block mopar price check

You can build 450 hp with a good 360 build and easily with a 4" crank. I'd stay away from the heads unless they were magnafluxed and pressure tested. Honest for the power you are looking for I'd call Brian at IMM and buy a NEW set of iron heads from him.

Find a good 360 block, heads from IMM, a Performer RPM and a cast Scat stroker kit with a descent cam and it'll make 450-475 without breathing hard. Strokers are a blast to drive, they think they're big blocks.