work or perform right?
BRF 200R4 is the correct coded tranny for this car. There are a couple other 200R4 applications that are "close" and could do. I think the one's out of a Monte SS, 442 and 84/85 GN's can fit the bill. Some of the most important pieces are the valve body, servo, govenor etc.
Lot's of experts to help here. You might need to clarify your original question a bit.