Hesitation, misfire, stumble and hard start

I have a 79 monte carlo with a 267 2 bbl Rochester 2M series Dueljet Carb. I have always since had a hesitation problem stepping on the gas which I have never been able to correct. In the last couple of weeks I noticed that my car was misfiring, so I gave the car a tune up and noticed that one of the spark plug wires was split. Then as I was replacing the rotor I notice the thin metal piece was broken in half. I replaced the distributor and rotor, started it up and running great. The next week it was missing really bad and I found that on the new rotor the thin metal piece was broken. I replace yet to have a problem, but it was still missing. So I replaced the fuel filter and I notice that the car was running alittle rich so I adjusted the carb and everything was running great. I drove around and parked it, I went out to the store a little later things seemed fine. (Still had the hesitation if I stepped on the gas but running smooth) as I was pulling up to the house the car wanted to die as if little fuel was getting to it. I set it in park and it died. Tried to start it and would not turn over. I went in to the house and let it sit for 30 min. I tried again and got it started by keeping my foot on the gas pedal but the motor stumbled and I had to keep my foot on the gas. I messed around with it and got it to run but it still stumbles.