Not much to go on here. You have the 4-bbl Quardjet carb I believe?
things to check...
fuel pump pressure
accelerator pump on carb
cripmed or collapsed fuel line
When was the last time you had an engine check and full tune up?
The list can go on and on....
weak ignition module when warmed
plug wires breaking down
By the way...welcome aboard.
Some more suggestions should follow...