OK Classic Industries has this part; Pontiac Engine Conversion Brackets-Late Eng. Into 1st Gen. This kit facilitates the use of a 1970-81 Pontiac engine in 1967-69 Pontiac F-Body chasis. Due to a 3-bolt mounting configuration on 1970-81 Pontiac engine blocks, an adapter bracket becomes necessary for proper engine positioning. This 2 piece conversion bracket set converts 3-hole motor mount pad on a block to 2-hole mounting. C269514 70-81 engine into 67-69 Pontiac F-Body $69.95 pr.
i beg to differ on this very subject. i have a 72 block with 3 holes and used the stock 400 mounts with no alignment issues or problems!
I doubt it unless you show me a picture. A 72 block would have been made for a 72 car that has different style engine mounts. Three bolt holes doesn't accommodate both styles. Go back and check again Drew. Why else would they sell the kit?