340 misfire

How was it "redone"? Was the cam updated?
The best place to start is the timing curve. You have 18° initial. Is that with the vacuum line to the distributor connected or disconnected and plugged? What ignition system? What is the total timing? When is it all in by?
After timing is the carb... What rpm is it idling at? Where are the mixture screws (in terms of # of turns out from "snug")?