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All the brkts work the same from samll block to big block. They are set up with two sets of mounting holes. The big block probley had a/c and sonuds like the small block did not. That is why the pulleys don't match. I would use all the pulleys from the engine that came out. The water pump may need to be changed. The other problem is people mix the brkts up between a/c and non a/c cars. The 455 will drop in the exact same spot and all the parts from the small block will bolt right in. Be sure to use the small block engine mounts and you will have to play with the exhaust pipes. The head pipe will bolt to the 455 manifold but height is diff. You can use small block manifolds but height is still off. A muffler shop can fix that in matter of minutes.
Gene
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