66 Dart dual exhaust

Yes, I understood the problem from the beginning. The 90 degree allows you to unscrew the filter coming in from the rear or the front. Once mounted it can be rotated to almost any clock position but you will no longer unscrew it coming directly away from the engine, instead you unscrew it 90 degrees from the direction it currently screws in. Check out the pics from under my 318 69 Barracuda....

PS - I have a passenegr 360 2 1/4" magnum exhaust manifold so my exhaust exits over and behind the oil filter but the principle is the same, you rotate the adapter into the clock position that gives you the most room/clearance.
Treblig