car craft feb. 2001 had steve dulcich with a 12:1 440 and ported closed chamber 1967 915 heads and a 260*/258* @ .050" Comp roller cam on the dyno with 2 different intakes. I know this is more radical than what u are planning, and to get a decent comp. ratio u would need to cut the open chamber heads a ton, but everyone hang with me for a minute, the article title was "the tunnel ram lives". so it idled at 800 rpm, with a holley street dominator and an 830 carb it made 621hp at 6200 and 577 torque at 4900. with a weiand tunnel ram and 2 750 carbs it made 667 hp at 6500 and 623 torque at 5100, and 513 torque at 3000 rpm-the best low end of 3 induction setups tested
