I have a 498 and a 469 both 400 low deck motors. 498 drag race only 1.122" CH piston. 469 1.660" CH piston street strip car. The 498 rotating assmebly is light and helps it live @ 8500RPM.
Street motor sees 7500 RPM once in while.
With the heads you have either will work real good.
Good Luck!