70-76 fit the rounder front ends and the 77-81's fit the flat hood models.
SHAKERS:70-76. 70-72 mount with studs to the aircleaner, 73-76 mount with rings like stated.
HOODS:70-76, just bracing that you are not concerned with.
FENDERS:70-81,just bracing and mount differences.
main difference is 77-81 hoods and scoops are a beast of their own. all non turbo hoods are the same as far as i know. there was talk but not sure they confirmed a difference in some later small block chevy 305 engine TA hoods.
there is a 77 early 78 pontiac scoop which is about 3/4 inch shorter in height, a later 78 pontiac scoop, a 403 olds scoop, a 305 chevy scoop.
think that is all, but always willing to learn.
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