Can someone point me in the right direction as to how to use a vacuum gauge to adjust fuel mixture and timing? is there a tutorial somewhere?

I have reason to believe that my 216 may be running a rich.

Last edited by CJDublu; 06/02/2016 4:54 PM.
~Justin

1937 Chevy 1/2-ton
"Wylburr Clyde"
In the Stovebolt Gallery
More pictures on Google

My Grandfather bought it new and Dad drove it through highschool. The 3rd & 4th generations put it back on the road on 8/8/2015!