Performer RPM Magnum heads?

fully ported they will support well over 500HP which you'll need to get low 11's. I did a 422 sb a few years ago using the Eddy mag heads, our cam, Indy intake, 950 carb and 10.5:1 and made 565HP with it. It also made 550's TQ.
1.3 lbs-ft per cid solid build