That's a bolt in.
The frame from the Caprice you have is the same as a 77 Catalina / Bonneville. The 400 engine was an option in 77. Short of changing wiring for the Pontiac from the Chevy configuration and the A/C brackets it's a simple swap. You may have to move the crossmember forward for the TH350 and a find a longer d/shaft. If that's the case I'd look into an adapter plate to use the 700r4 if it works well.
Mike
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so many pontiacs, so little time..................
moderator is a glorified word for an unappreciated prick..................
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