Mopar small block fan routing diagram
boy your in for a treat...just wait until you walk up to the counter, tell them what your working on and hear them say "according to my computer dodge didn't make cars before 1985"
I'm sure the information your looking for is out there (might even pop up with a simple google search) but why not measure and be sure?
your working on a 40 plus year old car, the possibility something has changed, or someone has swapped pulleys at some point in those 40 years is definitely there