MSD will not run car HELP

If you did not, you should bypass the ballast resistor.

The polarity of the pickup will not prevent spark, it will make it "out of time," google "rotor phasing"

This will cause the spark event to "move" in relation to the rotor in the distributor, will cause erratic running, out of time, and cap/ rotor carbon tracking.

I'd bet money, that the trouble is in the pickup/ distributor. Photo closeups would help. Inspect the rotor/ pickup for rust, debri, and strike damage.

I am NOT aware that I've ever found any Mopar distributors to be improper pickup polarity, that is "for now" I'd wire it exactly as shown in the MSD destructions.

and one more time, google "rotor phasing"