Electronic ignition issue

Hey guys need a little input here as to my issue on our 70 340. First of all I am not well versed in electrical issues (I believe the term is electrically challenged,snicker) nor do I have the proper tools to deal with these issues so trial by error and of course a few dollars to try and get things sorted out. But you only learn by trial and error so here I am. The car is running the electronic ignition upgrade and likely installed some years back. We parked the dart for the winter and prior the car ran good and strong. Brought it out of storage and put about a 100 miles on it without issue. Last week I fired it up took and fueled it up went for a rip and about 1/2 hour into it we felt a low idle miss. Seemed to smooth out once we got it into 2nd and 3rd gears 4th we couldn't feel much on the highway.Well the low idle miss got worse so I pulled the plugs and found that the gap was set at .40 not .35. We bought the car used and with a questionable checkered history on it so in the real world the history does not exist and was something we were prepared to deal with as we have other plans for it. I reset the plugs to .35 and made sure all was good. Fired it up and this seems to be where it has gone down hill. It appears that cylinders #2 and #5 are not firing.I used a water squirt bottle to determine this. I have done the cap and rotor(3 sets),new coil,new plugs and ECU,checked the reluctor gap and it is a tight .008 and and still #2 & #5 appear non firing.It has accell 8mm superstock plug wires that look to be in decent shape. I do believe this could be simple to remedy but not knowing 100% of what else to look for I guess I need a little help. So in advance I greatly appreciate any kind of input. Thanks in advance, Jeff