I ran 4.88s with the 3.09O/D for a few weeks,with a GV for splittin and double O/D and 7 useable ratios,but didn't like it,much. I switched to all kinds of chunks and 3 different tranny ratios.
I ended up with the 3.09/Direct box, the GV and 3.55s. This is MY favorite;a 10.97 starter, and 2.77 final drive.At 63, my cave-man days are all behind me now. :(