maybe, maybe not. depending on when and how you visualized the carb squirt.
i had a 74 newyorker stump me with this one time. although it didn't backfire, it ran great, then would just quit. sometimes going down the road, idling, WOT, you never knew when.
i replaced the fuel pump, filter, rebuilt the carb, on and on.
then for some reason, and i can't remember why, i pulled the tank, and found it crusty and the sock plugged.
now i had owned this car for a while, and did not have any problems with it. oil changes, fresh gas all the time , etc.

i know this may be a very LONG shot, but who knows ?
just throwing something out there that may, or may not be even remotely related.

and i just thought of something else that bit me in the azz one time, causing similar problems. my cousin Charlie's model A hot rod.
that turned out to be a PLUGGED "vented" gas cap !
same deal. run good, good carb stream, then poof ! quit ! ....... fire up ok right after, then same thing.

as 'ol Cab says, "that DADGUMMED Murphy guy !"