71 charger 318

I have a 1971 dodge charger 318 2 barrel , it will not run steady has a miss but it comes and goes, i checked the Valves, replaced the rotor, Cap, Plugs, Wires, set timimg, it will idle fine then it wants to stall , i have owned it 13 years , 53,000 original miles and original Motor , any suggestions????????

Coronet 500

I would look for any fuel delivery problems and possibly time for carb rebuild.
Does idle mixture adjustment have any affect on the problem.