318 Engine stumble

31-32 degrees is the specified dwell angle. The longer dwell angle is the result of the points gap being smaller than it should be. So that is very likely contributing to the issues.

BEWARE that the points rubbing block takes a specific type of grease. Use just any sort of grease and it may wear the nubs down in a big hurry and ruin the distributor. Lithium grease will destroy the nubs... ask me how I know! LOL

Do a Google search for 'grease for ignition points'; perhaps someone here knows it off the top of their head.