lol, a 8 3/4 behind a slant 6? Thats weird, I wonder what the factory was thinking on that one. By any chance, do you happen to have some front disc brake setups?
sometimes you have to wonder what they where thinking of, my car had a 7 1/4" suregrip with 2.62:1gears behind a 318 2bbl when the car left the factory!