Doesn't need to be a particular suffix, only a true C80E part number, with 7 or early 8 date code. I have a J code intake, and these heads came of a 302 4v, but somehow they are '69 heads, and it is the first for me. I thought all California Specials were '68s, and these came off a CS. I have been saving these heads for over 25 years because I know the car they came off of. Joe-JDC