Pissed off with motor, want to change
What was your timing set at? Are you sure the dust. Gear was installed correctly? It should point to the contempt drivers intake manifold bolt. If these check out, the pulling 1 plug wire at a time, see if can be isolated to one cylinder, or if it is totally random.
You're on the right track, but don't PULL plug wires. Instead, GROUND them at the distributor using a probe. When you pull a wire off, it creates an open circuit, will cause crossfiring, and can actually steer your wrong
So far as the "gear" you can time these engines with the gear in there "any old way" as well as the dist, just as long as you bring up no1 cylinder 'ready to fire' and plug no1 wire in where the rotor points.
Any chance your distributor is simply loose and moved?
You need to treat this as a "one cylinder" problem to start.
Try grounding one wire at a time and RUN A COMPRESSION CHECK. Seriously consider pulling the valve covers and do a CAREFUL examination of all valves opening / closing.
Consider trying a different coil, and if you are using a Mopar ECU, it is possible that you got "junk" (water/ chemicals) under the transistor/ heat sink on the ECU.
I used to have trouble with this on my old landcruiser, running a Mopar SB and Mopar ECU. Finally moved the coil/ ECU up under the dash. We'd get out into deep snow or mud/ water, and the ignition would break up