had a 420 behind a 350hp 327 in my '63 1/2 ton with 3.73 rear. It was pretty sweet setup. 1st was no longer granny, but still didnt use much. No overdrive, but neither di the old camaros, chargers and mustangs. Upper three gears were all synchro. I'm with Ed. the T5 out of s10 is lighter duty but there are other t5 options.
