vivivivivibration

Yes leave your engine sitting in there the way it is for now. Fix one thing at a time, get the minor vibration issue taken care of first.

I like to set the plugs at .035 ths with factor mopar ignitions. You are running the Hotter MSD box and Coil, you can still set them at .035 ths lots of guys are setting them at .040 ths with the hotter ignitions, your call.

We all like to get our personal preferences involved. Now that we have figured out to replace that original ignition power robbing mopar starter with the new Smaller High Toque Starters. It puts back more electricity to the small Factory Mopar Brain Box with ballast resistor set up and you really don't need the whole MSD setup unless you are super performance minded.

With your Stock Built 340 you can keep it looking nice and working nice with a mopar electronic ignition. Just my own ideas, I like the way Ma Mopar built things. Very high engineering standards for the day.