Spark/ignition issues?

Alright, something fishy is going on. I sometimes lose spark altogether. I have it right now, and I just checked all cylinder wires and they are getting spark and seem to be in time (pattern of timing light flash is same to the eye). (I keep checking this quickly by using a timing light for the strobe. Occasionally I have been doing it by pulling a wire and holding close to ground, when my son is around that I can have him crank over the engine.)

Even when cranking to check all cylinders are firing it did not start up. Damn near close though, it's just at that point of wanting to.

Coil gives me a good 13+ volts when ignition switch is in run position.

Obviously I have an ignition problem....but back to my original post of this all starting with the removal of the carb for a few minor adjustments, I have a question about vacuum. Will poor vacuum cause the fuel not to atomize correctly therefore also be my problem? When I put the carb back on, I just left the same gasket on. Are they strictly one time use? It was a new gasket, just bolted on the carb with it a couple weeks ago. It was all still intact, came off the intake cleanly and stuck to the carb. Seemed to still seal tightly when I put it back on.