Update: I know I've said fini twice but what the hey.
I posted earlier about a persistent rough idle caused by a vacuum leak at cyl's 6 & 8. I finally parked it long enough today to address it by swapping out the Weiand intake with it's gobs of RTV ozzing out of every joint surface with a brand new Edelbrock Performer EPS dual plane intake without gobs of RTV....
I'm happy to report it now has a lot smoother idle and it's pulling a nice steady 19" of vacuum at idle.
Pic
Pic 2

I also pulled the plugs for a look see. They have approx 700 -800 miles them. They're Champion R45's.
This is #1 plug, the others look similar.
Pic 1
Pic 2

It looks like they're too hot and/or a little on the lean side. When I readjusted the mixture I turned them out just a hair to get the steady 19" reading. So I'm going to check them again in 500 miles or so to see if they look better.
Thinking about picking up a set of R44's if they don't.
Dave

1949 Chevy 1/2-Ton 3100
1949 GMC 1/2-ton 100
In the Stovebolt Gallery
More pix on Photobucket
Video of the 216 running
Video of a Winter Cruise