If the rearend is the original GM 8.2, Pontiac/27 spline pinion, I think your gear choices will be very limited. Richmond and some of the others only list 3.55, 3.90, 4.11. If you happen to have the newer 8.5 corporate rearend, then 3.42's or 3.23's are available but not the 3.55's. In any case I wouldn't recommend anything over the 3.55's.
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69 Bird w/1970 400 block(409 cubes), #64 heads, hyd. roller, Q-jet by Jeff E., original interior, ps, pdb, th350, and 3.73 gears. Pump gas, street driven muscle. 3800 lbs. race weight. Best, 11.39 @118, my son's car.
79 T/A w/463, Scat crank, Eagle rods, Icon pistons, Lunati solid roller, 262/270, KRE 325 heads, Northwind intake, QF950 carb, full interior, ps, pdb, th350, and 3.73 gears. Pump gas, 3650 lbs. race weight. 10.60 @ 126 so far...
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