missing on number 2 3 5

swapped the original intake and 2bbl carb back on it still wont run i had another ballest resister and changed that i cant find any broken wires and cap rotor everything looks good it just spits a little when cranking it i cant get it to really run while engaging startee it just hits and misses ehile trying to start it. how can i check my switch and could my distibutor have gone bad i think its the original?