Frequent ebay seller doesn't know what he doesn't know. Andrew from MagMustangs should know better. He has a fuel pump that he claims is a NOS late 67 GT500 fuel pump . Its biggest problem is that it is for a small block and not a big block. The pump arm has a distinct shape that is different between big block and smallblock. Given the fuel pump is a re manufactured fuel pump most likely it was rebuilt with misc parts with no regards to what the flange number indicates. I used to try and give heads up to mistake this seller would make in a helpful way but smart ass reply's in the past indicated that I was wasting my time. https://www.ebay.com/itm/154438496731 . Please be aware.
Seller has acknowledged your correction in his description as of today.