John I HOPE you find the pulley and unlike all of the others I have examined--has a stamped part number. I find no part numbers on 64 a/c w/p pulleys.
I doubt if a narrow 1/2 in belt existed(at least not intentionally) after all the 64 goat was not the first rodeo for that size belt.
I would be comfortable with a .4375 belt in both the 1/2 a/c groove and crank had the engineers designated it. The w/p acts more like an idler. But if GM wanted a 7/16 belt, than they would have called for it. And as for catalog errors continuing on into infinity, I can point out quite a few both in the Pontiac and Chevrolet mpc`s. (One chevelle item was leaf springs under the famous Z16 with a part number still listed in the 1971 MPC. They had coils)
I`ll get some pics shortly of original pulleys and post.
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