Head will work yield maybe 20 HP, and that's on the high side, cams another 20 HP or so. If you get an aggressive grind and some decent breathing long tubes, then you'll be set.

SBC motors also have 2 extra cylinders and a ton more displacement.

I know LET made some custom cams that were more aggressive then the Schrick, but they are pricey. Cam research and production isn't cheap.

If you do decide to pursue this further I'd love to see the results.

Good luck, and if you need assistance in finding production facilities PM me and I can reccommend some fairly affordable ones.