Adding Power steering but need help with A/C interference

Found out something interesting today. My buddy told me that my 1967 original water pump and timing case are different than later model water pumps and timing cases. I took a look at his 68 cuda with a newer water pump and it is different. Does any on have p/s (a/c or not) on a 1967 a-body with an original style water pump. I will try to get some pics of my water pump. One thing I noticed was the original style water pump has extra ears on it or mounting (?) a p/s pump(?). The other thing I noticed was that I have a 3 belt crank pulley. Only the a/c and alternator grooves are used, odd to me that this was added when the a/c was installed back in the day. Could this have come off a p/s -a/c car?