Edelbrock 1407 issue

Bewy said
Still do the checks I outlined. New means nothing. I fitted a new pump plunger to a TQ. Within a few weeks, the rubber cup rolled up & no pump shot!

That was because of the soft type of rubber used to make them E fuel compatible.

I checked the fuel pump shot, and I think you are right. Something is wrong with it. On light application there is almost no shot.