Muraski17

Hey guys, brand new to the forum world, but I have a 1978 620 pickup. This thing has been a nightmare since I got it (the last guy did some really funny stuff to it). But the other day I was working on it when the crank pulley came loose and ultimately broke. I'm looking for a 2 v belt crank pulley and having a hard time. Does any one have one they'd be willing to sell? Or does any one no what the interchangable years would be? I found an 83 in a pick and pull, can these be interswapped? Thanks ahead of time