Internal or External Balance?

Hey 340Mopar appreciate all the help with this . Just a side thought, I replaced the old style bronze pilot bushing with the new dodge style roller bearing type (which isn't as thick) and there is a small bit of open space behind it. And what if I had accidently pushed that bearing further back into the crank when I was putting the transmission back in and now the tranny input shaft isn't riding in it all the way? But I would think it'd make a helluva rackit all the time. Oh well, I've spent too much time and money on cars this year so I might have to shelve this project till later this summer.