Engine/Tranny Bolt Pattern Compatible?

[Two48s]

My first question in this forum... I have a 48 GMC 1/2 ton with a stock drive train, but the motor is blown. Is the tranny bolt pattern the same as a small block Chevy, or do I need a different bell housing? I know there will be many other issues, such as exhaust to steering box clearance, and motor mounts. I have seen many other posts about those, but not the engine/tranny compatibility. Also, what about the clutch/pressure plate/flywheel? I have an engine from an automatic, but want to stay with the 3 on the tree. I know I will need a pilot bearing, but will the flywheel assembly bolt onto the crank of the SBC? I am trying to figure out as much as I can what I will need before I tear it apart. Thanks!

BTW - in another thread there was talk of "unique" names to places - how about the "Bong Recreation Area" in Wisconsin?