76 Dodge dart wont start

Ok, first off I have a 1976 Dodge Dart with a 318 that does not get driven very often and will sit for long periods of time. I moved my dart the other day, then a day later tried to fire it up and now it wont start. It acts like its not getting spark but I do see spark when I pull a plug wire. I checked my grounds especially at the ecu they all look good.

I do have a tester and I have tested the ecu, dist and coil all seem to be working according to the instruction sheet that came with the tester.

Should I try replacing the ballast resistor first and then go from there? What are the odds that my gas went bad from sitting for an extended period of time and fouled my plugs? I pulled one and it didnt look horrible, maybe I should replace them anyways. It is a car that does not get driven very often.