Moparts member Jim LaRoy (Formerly "Hey Old Guy", curently "LaRoy Engines") has done several dyno sessions with low compression 440s and has published some impressive numbers even with engines as low as 7.5 to 1. He posts here, FABO and FBBO and even DodgeCharger.com. It might be worth looking into. Well prepped heads benefit any engine, even ones with low squeeze ratios.