pulley setup questions

[Nate003]

hey guys, i am in the process of trying to get my 68 chevy PU running, i bought a motor that was in a 72 chevy pickup (don't know if it was stock in that truck or not) but i had to switch the power steering pump setup when putting it in the 68. also the alternator is on the passenger side, not on the driver side. and now all the pulleys line up so that everything uses one belt, and i went down to the auto parts store to get a belt, and they said that setup wouldn't work, and that i need to put a differant pulley on the power steering pump so that it'll run a differant belt then the other accessories. has anyone had a problem with this before while swapping motors from differant years. if anyone has any pulley advice please let me know. I apprieciate it. thanks.