James, it's dead easy to check if your coil is working.
Unhook your HT lead off the dist, hold it about 5mm off an earth then with the ign ON, unhook the LT the wire that goes to the distributor and touch it on a earth. Each time you do it, you should get a fat spark.
My 2A has a 186 & has a GT40R coil so it needed a ballast. It was much cheaper to buy a generic ballast resistor rather than a new coil (about $10 vs $40).
This is a good link to explain ign system checking:
Car Ignition Coil Testing - YouTube
If that doesn't do it, there are about a dozen others that may explain it better!
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