Sounds like someone has already did a swap in that car. Are you sure that you have your facts straight on the engine size and transmission type. If so, the 307 would likely be an Olsmobile design which has the same bellhousing pattern as Pontiac. Plus some, if not all 200R4's have the dual bolt pattern case that accepts both the Chevy and BOP blocks. The motor mounts can be used from any 73-77 Pontiac powered Lemans, Grand Am, and Grand Prix. HTH
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North Dakotas fastest REAL GTO
10.10 @ 131 MPH in the 1/4
Hoping to get it back together some year.
www.jandjrepairandrestoration
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