The control module is under the rotor button. Make sure you have good grounds too. You can take the module to Advance Auto and they can check it for you. Tell them to run the test 3 or 4 times to get it warm, up to operating temp. It's not hard getting the module off. 2 small screws and the wiring. Did you swap to a known good coil? My bro inlaw had the same problem just a couple weeks ago and we tried one I had laying around. It didn't work so we tried another one and it fired right up.
It will be to the front of the dist.., it has 2 screws going thru the it. The screws are like 6 mm. or maybe 8. The picture above is what it looks like but it may be a different color. It also has some dielectric grease on the bottom of it. Don't wipe it off. When I said the front of the distributor, I mean inside it, under the rotor button, on the front side bottom of the dist.
Did you regrease your new module before you put it back in? I had a few head problems when I owned my 86 with the 2.8. But a valve job solved it quick. If you still getting fire and it won't start now after a backfire check your carburator those are very touchy carbs.