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Hey Mike,
I had the same problem with my March pulleys. I too have a 351 W motor and a Edelbrock early model pump (passenger side outlet). My upper pulley was way off. I don't remember the specifics but I think as much as 3/8 to 1/2 off. I thought about using shims from Mr Gasket for fans but then realized the whole assembly was off. The "alignment hole" was off center when we put it on the lathe! I ended up having a bushing made that compensated the space I needed plus re aligned the pulley too. It kinda sucks because they make good stuff but It had been years since I bought it and had no recourse. Find some one with a lathe and they can fix you up quick! Matt.
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