Oh boy problems...

You can tell if it's a fuel problem easy next time it happens by pulling the air breather and pumping the throttle and seeing if the accellerator pump is shooting fuel. If so it's not a fuel problem. If it's not it's a fuel problem. With these old cars it's more likely a electrical problem due to the age of the wiring. I'd check the bulkhead connections first. That's always been a problem area on cars of all brands. Do you have a test light to carry with you? If so that could be handy for trouble shooting. If it happens again see if you have power at the ballast resistor. If you do you might have gotten a defective electronic ignition from Summit.