issue with my distributor points on my 64 Dart

I use synthetic disc brake grease on the cam, felt pad and contact foot of the points set. Check and polish the cam before adjusting the point gap. Verify the dwell with a meter after setting the gap to. Set it on the small side of the spec as dwell grows with wear.

If the dwell is still changing, you may need to replace the distributor bushing or replace the distributor with a known good unit. Be sure to verify the internal advance settings match though.