1972 Ford F-250 running

When its warm and wont start, remove the top of the air cleaner, open the choke and have someone try to start it. Get back with the result. Give it 2-3 pumps on the gas and hold pedal down to the floor and choke wide open when cranking.

Start with the basics, and work your way up, Last tune up was? Wires plugs ALL filters? If all that is ok, check for a stuck EGR, then test fuel pump pressure, If it won't restart, determine what's missing, the engine needs three things to run, Spark at all plugs, gas to all cylinders, and compression in all cylinders, tho an engine may run lacking one in one cylinder, it won't run very well! Post the answer to whats missing then we can figure out the next step.
https://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm
Go here and checkout our video.
https://www.2carpros.com/car_repair_video/test_engine_ignition_system.htm
and this one!
https://www.2carpros.com/first_things/car_cranks_but_wont_start.htm
https://www.2carpros.com/dia/how_to_check_compression.htm
https://www.2carpros.com/dia/index.htm
Check the gap on your points....real important on point ignitions!