manual vs Automatic crankshaft

Hello everyone,

I just ordered a rebuilt 360 that'll be delivered in a few months and had a quick thought I wanted to run past the experts. Are the crank on the manual and automatic cars the same? I'm planning to use the 3 speed from my duster for now and eventually upgrade to a four speed down the road. I just want to make sure I'm not going to have an engine show up with a crankshaft that I can't use...

Appreciate any advice!