Hello Peeps!
Since it's a rainy day here I decide the next things to start looking into is to see what the plugs are telling me about the running condition of the car. It's been about 20-30km and not much driving since I've started to adjust the carbs and moved the vacuum advance to port vs timed (i.e. more timing at idle). The car was definitely running rich before, and is probably still rich but less so now. I only did 2 plugs for now just to see what I find, will probably pull the rest later.

Car has around 9300km at this point, plug likely have been in since rebuild.

Here's what Cylinder one plug looks like:
cyl 1 042826.jpg

And cylinder 5
cyl 5 042826.jpg
cyl 5 042826 - 2.jpg

Gap is at .35 (a little low isn't it?) and its a NGK Vpower R5671A-8.

What I'm seeing is:
1. Running rich (carbon build up)
2. Some carbon build up on the electrodes, especially Cyl 5 on the case of the side electrode

I don't have enough run time on the "new tune" to see if its leaned out yet, but looks to me like the plugs are too cold? Would appreciate your opinion!