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'm pretty confident that I'm close with the timing (rotor at #1, no backfire). Car starts and runs but idles rough when put into gear. Car ran good before exhaust was installed. I was told that I would need to re-adjust things after exhaust was put on. After reviewing threads about compression, I thought mine was too low. My vacuum also is low. Will post pics tomorrow when it is light out.

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...