I have an 85 IROC the motor is a 90 350 and I was puting the new trans in today and was looking at rear end and has borg warner cast in the center section it is a disk brake rear aswell if that maters is this the right rear for this car and is it ok for a basicly stock 350

Yes. It's a bit stronger than the OE ten-boltv (which is in my 85 IROC); however, I understand that parts for it are difficult to find.

JamesC