pump and pulley question

Why do think the pump is wrong? I have a 67 barracuda 273 2bbl with a/c and it has a TRW pump. It also doesn't line up very well. This is not great, but very common -- many threads on this subject. If you go to all the trouble to change to a Saginaw, it may not line up either. On my 64 Sport Fury, I sent the pump in to get it rebuilt. I told them that if they would put the pulley on 3/16" different on the shaft, it would line up better. They wouldn't do it saying they could only rebuild to factory specs. Thanks a lot!