B body 4spd in an A body

I just swapped out the mainshaft and extension housing for A-body units. My trans is a 1970 B/E body unit with the larger 308 bearings. Passon performance sells an aluminum extension housing for that application . I would have just used an iron factory one but they never made an A-body length extension housing for the 308 bearing. Not hard to swap the parts out and you can refresh the rest of the trans while you are at it.