i just added power steering to my '70 s.b. and boy is it great. however, i'm concerned that eyeballing the double groove pulley i installed is not in round. i got the pulley for free from a local engine shop's junk pile. i cleaned and painted it, however, i'm wondering if it's out of round or if adding accessories to the crank has caused an out of balance condition? i'm i going to trash the engine by running it this way? i just bought an aluminum 2 groove replacement.