I put a 261 in my 37 chevy sedan. Dual carbs, split exhaust. The torque tube wasn't the problem but I broke rear axle shafts twice. The sceond time I put in a S10 4x4 rear end with 3.73 gears and a T5 5 speed. Havn't broke any more axles and much more drivable.
My problem of breaking axles may have something to do with the fact that I have to down shift and listen to the exhaust pipes crackle. I just can't help myself. Those torque reversals can't be good for axles.
Gael
