Moonshadow;There may have been different Eaton pumps between trucks and cars, for example, the "Big Job" trucks running power ram assist, but I think the brackets stayed the same. An easier fix to the problem may be to look for a different water pump pulley with a different offset. There are a bunch of Ford water pump pulleys on ebay, you just need to measure the offset on the one you have and figure what it would take to fix it. Maybe a 289 double sheave water pump pulley would work? The bolt pattern and center hole are the same, but the diameter may be a little smaller.
Rono