it is a common power pump it was before the srepent belts the pully on it was for a v belt i think it was 86 but all gm car s use them now take a trip to the bone yard the pully is bigger then the pump the pully is about 4 inch you say you front leans froward this dose not change the toe in but the caster the more it leans back the better for straight line tracking look at the old drag car with straight axel in them if turned to much the wheels fell over this was caster the pit crew set the wheels straight great for straight lines but not to turn the back stud for the A arm is for this and to bal the camber with the front stud add or take out shims