71 Mach1 , M-code, has a 408 Cleveland, svo aluminum heads, Roush intake, solid roller, engine uses 93 octane fuel. 663 hp @6800 rpms, 567 lbs torque @5200, engine makes 466 lbs torque @2900 rpms. I have dyno and build sheet to prove hp and torque numbers. This engine has good street manners and...