Reply to "Quit Running"

Just to start off I know why I never owned a Chevrolet. Id like to bump this and describe my issues. I started 1717 last Saturday, sounded differant than normal kinda like a "stuffed" muffler, went a 1/2 mile from the house and it just shut off. She tried to start but would back fire through the carb and never ran right again.
I have a Unilite with a Promaster coil.
My dizzy has been setup with dual pick ups. I pulled the one in use and moved the other to the correct side so I didnt have to rewire the cap.
I replaced the ballest resistor with a new Mallory #700 resistor. Also replaced the coil with a new unit.
Tried starting the car tonight and she did fire but would not run right. I shut her off.
Now where is this roll pin I have seen talked about here? Does the dizzy have to be pulled to replace this pin? Just a note fuel delivery is not a issue. Fuel is right on the mark in the bowls, and can see it discharge into the carb.
Help!!!!
I was just on the Mallory website, well so the roll pin is for the gear, I found a question in Mallory's knowledge base posted to them from a Pantera owner. Great answer from Mallory increase pin size to 3/16ths on Ford V8's.
Unilite Rollpin.