Slant 6 troubleshoot help!

1....If you can run it long enough to get it completely warm, adjust the valves. EOIC which means bump the engine until the EXHAUST just starts to OPEN, then adjust the intake for that cylinder

Bump the engine until the INTAKE has opened and is not quite CLOSED and adjust the exhaust for that cylinder

2....Check compression. While you have the plugs out, examine them, oily? Is one or two "burned white" IE burned valves or running lean, vacuum lean into that/ those cylinders?

3....Use your ohmeter to check plug wires resistance and inspect them all. Old school rule of thumb is no more than 1000 ohms per foot of wire, and they should really be less. Check coil wire too

4...Inspect rotor for damage, moisture/ dirt, arc "punch through" Inspect cap for arcing, dirt, etc

5...Replace points and condenser if used and set points. If you don't know how say so we can step you through that. BEST is with a dwell meter

6...Set timing, even if you have to "rough it in" on the starter.

Now see if it runs any better and recheck timing. Next, figure out if the mechanical and vacuum advance is working A few ways, first you can "flip" the rotor with your finger. Rotor should move against the spring CW as you turn it, then spring freely back.

Next see if you can figure a vacuum leak. Does it idle better? Try adjusting idle mixture screw. Turn idle screw in if necessary to attempt to get some idle RPM. if it has no affect, try unscrewing the idle screw, then put your finger over the screw hole while revving the engine. Sometimes that will knock some gum/ dirt loose. If you have carb spray try a little of that. It often won't help into the idle screw, but once in a while "does."

Check carb linkage for binding, figure out if the choke is working. Might be overchoking try blocking it open

Use water, wd40, there are others you can spray selectively around the carb mount and manifold joints to see if you have a vacuum leak. Check vacuum hoses, such as brake booster, PCV

There's a hundred things I do which I don't even think about, anymore. They just "happen" and get done.

Download the closest you can find for a service manual, from MyMopar. they are free