Your garage may have been right, i have a similar problem on my 8v, the water pump pully doesnt line up with the pully on the jackshaft.
water pump>alternator is inline.
the btm pully is inboard by 2>3 mm.
glad i'm not the only1 with this strange problem.
Does yours have a pressed steel btm pully or the heayduty cast type with rubber insert??
will measure both in morning and post any results.
woody
