Oil filter housing leaking, can't get it to stop SB 273

What i have found in the 67 FSM

Slant 6 and 426 hemi "oil filter adapter bolt" 3/4 x16 is 30 lbs.

Thats where i would start.

Just had a thought... What if the combination of parts you have has a bolt too long and you are bottoming out the bolt before tightening the adapter?

Or there is some crud in the threaded hole?