What is the casting number on the transmission located on the case? It should be C-15390 for the Chevrolet bolt pattern, the other style has the MOPAR bolt pattern and needs a special bell housing. I think the casting number is C-15475. There were two different styles of shifters, which do you have? I am working on installing mine and had the bell housing bored to fit the bearing cap instead of turning the bearing cap (Thanks BIGBADSWINGDADDY)

Check out the HO52 & HO72 EATON REAR DIFFERENTIALS post that I have going in the ebay/craigslist section for information and rear ends.

A-883 Four-Speed Overdrive Transmission - Over Drive It Under A Budget