1965 valiant 225 timing issues.

Found the 2 adjustments. I borrowed a timing light that has a dial on the back. With the dist all the way to the stop on the bottom it reads 12 degrees. With the new ignition it idles ok but has a little stumble from time to time. When you barely crack the throttle it falls on its face but picks back up when you rev it. Runs well once you get up to 2k rpm. I pulled a plug and they are sooted up big time so it must be rich. Very cold natured. It will barely run till it warms up. Im thinking I should run the valves but they arent clattering. Car has 96k miles and sat for a long time.
Maybe the carb has to big of a idle jet?