318 Engine stumble

The secondary stop is closed....and just barely cracked so it’s moved off the bore.

The float is just barely tricking out of the side when I take the plug out so it should be good.

The primary transfer slots have been adjusted correctly.

The transfer slots are supposed to work from 800-1600 rpm. Maybe the problem is in there because that’s the rpm range that the problem happens. However. The idle bleed and the idle well feed the transfer slots as well. It would have to be just transfer slots that were clogged. The fault spot seems to be in the transition.

What would a worn distributor cam cause? It would keep the primary windings in the coil to charge up longer and breaks the field later than it is supposed to? If this is the case. Would it show up at lower and higher rpm? How much of a problem does 10° Higher Of dwell cause? I could put the electronic distributor on there but it’s a learning experience to see what problmems lead to what.
The burned points could be a bad condenser not absorbing the arc at the opening of the points? I kind of looking for the understanding of why just to learn.

Could a vacuum leak happen at this rpm range? Why wouldn’t it affect higher rpm where it seems to have plenty of power?