How to change ’82 Chevy 350 engine w/an auto trans to manual 4 speed trans in my ’71 Chevy C10 250 engine PU?

The pilot bushing is pressed into the back of the crank and supports the transmission input shaft. Double check the rear of the crank to make sure it will accept a pilot bushing, not all small block cranks were machined for it. If it is machined for it, it will be about 3/4" in diameter and about 3/4" deep. If not, you might want to think about switching to an automatic transmission. Hope this helps. Christopher