OK so here is another update.
I finally got my vacuum gauge back and checked the vacuum on the 340...
Its around 6,5-7 range, so I'm not surprised I could not get it idling half decent with 6.5 power valve in it :) Secondaries never opened on the vacuum secondary carb.
Ignition updates and changes resulted in really nice spark, it also starts right up.
Another problem of this car is rust in the tank. I cut the fuel filter open and was amazed, it was half way full of rust. Now I do carb tuning with fuel from bottle until we clean the tank and put new fuel lines on it.
Please find photo of rear carb bowl after 3 days of playing with the carb. It was cleaned before install.
I will finish with initial carb tuning today if all goes as planned.
Need to work on jetting under load after we deal with the rust.
So far I have 4.5 pw, 64 jets in the front and 72 jest in the rear. Need to get smaller squirter for the rear...
Everybody that targeted the carb were right, but this car was neglected over longer time and now needs moren than expected. Whatever I touch needs some work...