As I understand it, the modified 209 engines with two engine mounts used in the 330 GTC and the late 330 GT 2+2 have exactly the same block. Just looking the engines, the GTC and GT have different carburetors. But are the any internal differences in the materials used or different forms of connecting rods, pistons, crankshafts, what ever. Do the two engines have different camshaft profiles? Different compression ratios? The RPM limit stated for the GTC is 7,000; for the GT it is 6,000. Why is there this difference?