Trouble tuning 340.

The guys responding here have hundreds of years of experience. Post some pics of the valve train, engine compartment, distributor.

Do you have a timing light, and know how to use it?

I’ll tell ya, the 318 in some broke junk 73 Dart swinger I got a few months ago just got started for the first time since I got it. It sounding like **** turning over, and would only sputter and pop a little, the distributor was way retarded and in 180 out ( still is, #1 is facing the fire wall, changed the wire order.) after messing with it all after noon and wiring in a MSD box, all hot wired, it runs, like ****....:lol:.

So the point is, be a detailed as you can in describing your issue and post some pics...