My question is I have a 1989 5.7 iroc 2.77 BW rear that has been swapped to the G92 3.27 rear. I see there are two proms for 89 5.7L. Should I have changed my prom? If so what will I gain and what will I lose by sticking with my standard prom.

16129303 5.7L 2.77 rear (my original prom in car)
16129307 5.7L 3.27 (g92) rear