If your car is running poorly it is more likely the "lean burn system" located in the air cleaner. This is an over done electric ignition that after 20 years is probably shot. NAPA sells the replacement module for $135.00. A MOPAR electric ignition conversion kit #P3690426 is about $200.00 and will fix your problem for good.
Don't go into the carb until you try the ignition. I did and it was the ignition system which I replaced and it runs great with the kit.