Always, always check your spark first.
When it quits again get out of the seat and Verify that you have a bright bluish white spark that will jump at least 1/4".
Short or yellowish spark will not do.
Requires no tools to pull a plug wire and check.
It sounds to me like you have a connection that's dirty and getting hot and you're losing power to the coil. I would go through the wires/connections from the switch to the coil and clean them.
Checking with a VOM or test light will help you isolate where the problem is.
It is not likely a vapor lock issue with a fuel pump in the system and those 3 cyl Fords have the fuel lines on the cool (intake) side of the engine.