1979 Dodge Truck hesitates when peddle slightly pressed

As long as the plugs and wires are good, and it does not need a tune-up the things to look for are vacuum leaks, the EGR coming in and it being too lean from the fuel system. In 79 the lean burn was also a problem but I doubt if you had that. On slight acceleration, the timing advances, the EGR comes in, and the idle circuit goes into an off idle circuit in the carb. A vacuum leak will cause two of these problems. The carburetor plugs, may need removal and you may try fattening up the idle a little. You can use a spray can of carb. Cleaner and try disconnecting the EGR valve.
A tune-up with Mopar parts and a carburetor overhaul was an everyday job until they went away. Could be electrical also. Choke coming off ok? Timing chain loose? Give it some ignition timing also. Ok Even the intake manifold was a problem because heat ran through it to help the fuel vaporize. Hard to do it online. Hope you understand. It must idle smooth.