Thank Scott.. obviously there is more to this than I thought!
Alright, I have confirmed I have both the '69 style timing cover and the 4.5" water pump here. So just to confirm what you are saying.. the AC cars had larger crank pulleys... and those need to match up to a power steering pump with a larger pulley as well? Is there anything special about the alternator on AC cars?
I do not have an alternator yet for this build, but I do have a power steering pump.. which came with my car. Now I'm interested in measuring that pulley to see if I have the larger one or not.