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You may have to wait a bit on your answer. Stands to reason if it was in a 73-87 Chevy, GMC frames are the same. The engine frame mounts will have to transferred but should be fine. We see Olds 455, Cadillac 472's but not seen a Pontiac in a squarebody truck.Yea when I look it up it spoke a lot about the old 455 that y I thought I should ask, but when I took the motor mount apart everything seemed to fit correctly it was just worn out and one side was missing the nut that held the long bolt that went on the inside of the mount. I'll wait to see what others have to say tho also. Thanks for the help bud!