Scott Roberts took his '68 to 10.47 @ 128 MPH with the stock 8.2 rear (added an Auburn posi, but stock axles). 406 CID, TH400 (TransGo "Stage 2" kit), 2,800 "stall" converter, 3.70 gears, "150 shot". The rear axle is the weak "link", true, but it's NOT the same as the Chevy 8.2, MUCH touhger.
A small block won't make NEAR the raw power (low-end torque, which is what "kills" parts) of the 400 Pontiac, so you should be fine. They still used the BW T-10 behind small blocks LONG after Pontiac abandoned them for the Muncie.
