Snake, the C6ME is a 66 and later casting which I'm sure you meant.

Kapp, As Snake as described (very well also!) your engine could be a 360,390.410 or 428. You will see when you tear it down. C6ME was one of the generic casting number from the day. The date code on the block will tell the exact date of casting. It's below the oil filter adapter area. Look on the small angled part of the block there for a number/letter/number(s) sequence. G.