[Lost in the 60's]

If the 2nd gen tank will fit between the frame rails, it should work. The fill neck is in the same location as the '69. Those fillers are common on the Chevelle lineup and, yes, they are a pain in the butt to fill. Today's pumps fill much faster and I have to hold the lever, rather than set it on the first step. They like to splash out when getting full too. I have a '66.