340 in a 1966 valiant, remote oil filter woes

The stock right angle oil filter adapter works fine . If you have the small head hollow bolt it works as is . The large head bolt can be modified by cutting or grinding down the head to approx 1/8¨ thick and then welding on a 1/2¨nut (3/4¨wrench) which gives about 1/8-1/4¨ clearance.