Engine Idle Shake

I would not. Too dangerous.
Even checking the timing in gear is best with two people or a bulletproof method of ensuring you don't get pinned to a wall or something like that.
My suggestion was meant to say make the adjustments, and then check for the drop in rpm and vacuum in gear.

See if you can get the engine to idle at lower rpm in neutral by richening the idle with the mixture screws, and then slightly reducing the idle speed screw.
Then try it in gear.
If the mix screws have no effect, then either the throttle at idle is too open, or the passages are blocked with dirt/varnish, or the fuel level is off - probably too high and fuel is dribbling out the boosters.