1967 cuda 273-440 swap details.

Schumacher mounts. I would avoid the transdap, lazy copy, they did not even machine the drivers side biscuit.
Actually, it's the other way around. TransDapt has been making these adapters since the late 70's, give or take. All the biscuit cut takes is 5 minutes with a hacksaw, not worth double the price and on-again off-again availability, JMO.