[AZKen]

The throttle squirt observation test needs to be done immediately after stalling. This will tell you if carb bowl is empty. if no carb squirt, hand squirt gas/dribble gas from a bottle down throat of carb after stalling. If that starts the truck, then it's a fuel delivery problem obviously.
From what you say, It seems that something is happening gradually. It seems it starts right up when you get ready for a ride. That indicates bowl is full. Something recoups after wait period.

So causes are:
1. Gas cap not venting. Vacuum occures. No fuel flow. So drive with cap off next drive.
2. Debris in tank, lines, filter. Debris blocks then releases....
3. Bad/weak fuel pump. Can't keep up.
4. Sticking/slow flow float valve/needle valve
5. The only way to test a fuel pump is an on the truck flow test. Disconnect center distributor wire. Disconnect the hose or tube at carb inlet. Insert that hose/tube into a bottle. Crank motor for 15 seconds. Observe good pulsing stream of gas into bottle.
6. Bad accelerartor pump seal
These tests will give clues to the cause. It's hard to catch a problem that occures not in the garage but after a drive. Then restarts after awhile.

Buy a new fuel pump. Mechanical, not electric. In this case, you have to have a baseline. The pump is the baseline. Only one filter is necessqary. Install it in the line before pump inlet.

The fuel pick up tube part of the sender has a sock on it. The tank would have to be pretty bad for that new sock to be clogged. Check all the rubber sections of the fuel line for collapse or degradation. fuel line size and hose ID should be 5/16 or 3/8.