[Tommy]

I have a 427 ci small block Chevy in my Cheetah. It was dynoed at 600 HP at 6100 RPM with a Holley Ultra XP 850 carb. It is not happy below 2000 RPM likely due to the weak air signal through the carb at low speeds. It is also cannot be equipped with a choke, so cold starts require some practice AND high RPM for a minute or so after start. . . Engine builders tend to use huge carburetors so they can boast of their big peak horsepower numbers, but those don't make for good street engines. . . . Keep in mind that peak horsepower plays a role in performance only at wide open throttle at peak speed, and that is only safely possible on a race track. At all lesser speeds it is engine torque that matters. So if you plan to drag race and you want to increase your trap speed, peak horsepower matters. On the street, responsiveness and torque matter most and the 750 is better for that.