Alu OD 833

I went through some of this recently as I gather parts for my E body swap. Some consider the OD less robust because the counter shaft has clearance in the case, but this can be bushed. Some don't like the 3.09 first gear. Supposedly the throwout fork assy on the original OD bellhousing is different somehow than standard A833 housing. A standard 4.3 or 4.8 bell housing apparently can be opened up to work with the larger 5.12" retainer on the OD trans, but probably smarter to cut the retainer down to 4.8.

There is a lot of good information here
4 Speed Transmissions transmission