Mopar small block fan routing diagram

krazykuda said
70 and up a/c cars had a double groove water pump pulley and double groove alt pulley. They had two belts spinning the compressor that ran off the crank-alt-wp

You are close, but I think the non-a/c cars had a single groove alt pulley - it aligns a little better...

70-up a/c cars had a single groove wp pulley that went crank,wp,ps. the rear two grooves on the crank pulley went crank, a/c compressor, alt.