As much as I hate to see an OHC Pontiac get killed,

You'll need the frame brackets for the engine mounts as well as mounts.
You may need to swap/mod the engine harness and the Rad has to be changed.
What are going to do with the OHC stuff?
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When I die, I want to go peacefully like my grandfather did, in his sleep.
Not screaming like the passengers in his car.