Something is amiss. When installing a 455 in my 79 T/A, I used brackets and pulleys from a 400 that came out of a '72 Catalina. The fan shroud was the same as what was in it with the 403 (as was the fan and clutch assembly). Everything fit fine. Engine mounts in correct? The chassis side of the mount stays in the same place for the Olds or the Pontiac engine (only thing that changes is the engine side of the mount).
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Just a blind squirrel looking for a nut.
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