A833 4speed OD trans Swap Question

Hi, hoping someone can help me with this question.

I want to take a 1975 A833 OD trans and put it into my original 340 4sp A833 non OD car.

From what I have gathered, my car has a 4.354" bearing retainer and the OD trans has a much larger 5.125" retainer.

Want to make as few modifications as possible.

Can someone help me by telling me what bellhousing can be used?

Some say you can machine the larger retainer down, and use all the orginal parts from the non OD trany, but the machinest said that turning the 5.125" clear down to 4.354" would not work.

He suggest going with another later model bellhousing that would fit the OD trans and also my 340 engine.

Can anybody tell me what bellhousing would work so at the end of the day the only thing I would have to buy is another bellhousing.

Also being able to use all of my other original parts such as fork, etc..

Thank you for any help.