small block pulleys

i have put a 1978 360 in my 72 plymouth duster and ran into a problem with the power steering pump pulley linning up to the rest

all of the pulleys and brackets and power steering pump came off of a 1973 340

the machine shop told me that the harmonic balancer is actually off of a 318 i dont know if this effects any thing

i have been running it how it is since it is my daily driver and the belt has started twisting

any suggestions would be of great help