383 in 71 Dodge Demon Carb issue?

The idle seems fine on it. As soon as you give it more gas it starts missing. Like I said the intake is a torker 383 and I read online that its an intake for higher rpms(2500-6000) and others have said to have at least 750. I believe it has a mild cam in it and it still has the single point ignition. Which I want to get rid of and put the pertronix sytem on it. What else could it be? It has new plugs, wires, cap and distibuter.