The parts book I was looking at shows the 9786901 PS pulley to be 69-70 w/AC which I see that car has. I think your issue may be that you are running an aftermarket intake manifold. I ran into that with my 72. It has an old school Edelbrock P4B manifold and where they have the t'stat housing is not the same location as a stock intake. I couldn't use the correct rear alternator bracket on mine as the hole didn't line up with the t'stat stud. I'm only using the front one for now until I replace that manifold with a correct 72 stock intake. Looks like someone bent back that rear alternator bracket on yours to get it to fit the t'stat stud, throwing the belt alignment all off.
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