shoe the under side. Are the scoop bodies stamped, or look hoembuilt? Didn't the GS scoops fit into the hood?
If I remember correctly, and I am usually wrong, but I think the 66-7 GS skylark had this type, and the 68-72 were molded into the hood. Last Saturday I was at my friends house that has both cars..I didn't pay attention.
I would guess Riveria GS or other fullsize. Something made in low production that wouldn't justify special hood tooling, but needed scoops like the skylark GS