Stalling when warm issue
when car died did you notice if filter was still full at that point? With the cap off it would not pull a vacuum but pressure should not drop either. With gauge before carb it doesn't look like if fuel were perculating that pressure would drop to zero. Did you say filter on pickup was not clogging? If all that is good and rubber lines between pump and tank are not collapsing then I am out of ideas for now. Hope you find it soon