I just swapped a 327 into my 64. The block casting number is 3858174. The pics that should hopefully show up are of the filter mounting area. It is a Fram PH30 and spins on nice and easy however, it gets tight real fast and will not tighten anymore. Now looking at the filter mount area it has what look to be a few "step down" areas or mounting area that gets smaller. Not knowing which vehicle came with this casted block is that the correct filter? I tried looking up a 65 nova with a 327 but the PH30 is what the auto parts websites says I need. I would guess that is for the Nova 2 recessed oil filter mount? Right now I have a decent size oil leak around the filter.