1965 small block A904 leak

Ok, I think I finally figured it out. After looking at the gasket, not the filter. The gasket with the part number ending in 8 is for a TF8 aka A727 and the one ending in 6 is for a TF6 aka A904. So it's just listed incorrectly (everywhere), since the A727 was never available in the early A-body.