powersteering pump

[19mike69]

i had a question about my p/s pump on my 69....i noticed how it has rubbed the inside of my alternator belt something terrible....i needed to replace the alt belt so when i loosened up the p/s pump it was all the way loose but the belt was still too tight to get it off ,and since the pump needed to be replaced too i went ahead and took it off...but you could clearly see where the alt belt was rubbing the p/s pump,does anyone know why?it is factory p/s....could the pump have been shimmed out away from the block for some reason?....any help will be appreciated,thanks