It's possible to mount the big Holley 4500 on a number of Offenhauser manifolds with a special adapter. However, 360 Degree Equa-Flow Single Quad 4500 High-Rise intake manifolds are designed from the beginning specifically to fit the Dominator. The single plane design, split plenum, and tuned intake runners combine to produce a broad power band that runs from 3,400 rpm up to 8,900 rpm.
This intake is garage sale priced because it is new old stock, these are still packed in early 1970's newspaper.
NO WARRANTY, NO RETURNS ON GARAGE SALE ITEMS