225 popping out the exhaust, but...

Yes it does sound like the coil. The points gap at .020" should keep the dwell from being too high, which could overheat the coil.

You can check the coils primary resistance between + and - terminals; stock will be around 1.5 ohms. Make sure you cross the meter leads together first and take a reading of the lead resistance alone, and then subtract that from the reading of the coil.

But, that primary resistance could be good and internal breakdown of the coil could still heat it up. So the sure way is to replace it. A lot of the box parts stores carry the Pertronix Flamethrower 40011 coil in stock for around $40-45. It is a 1.5 ohm coil which is correct for the stock Mopar system. And it'll pretty much give you as hot a spark as you can get from a canister coil of that size.