Alternator pulley question

I just replaced the alternator brackets on a 340. I replaced the air conditioning brackets with non air brackets and pulleys, now my double pulley alternator don't line up. Do I need a single pulley? This is on a 1971 340 small block with the later water pump.

Yes, you need a single pulley alternator for the non-a/c set up...

A/C had double pulley...

If you mix and match, the belt will work, but be at a slight mis-alignment...