Thanks.

Ok this is now finally on the road again. The new carb arrived today, so then just adjusted the float levels, changed some jets and installed it back in.
Car is working very well now! Lovely sound those carbs are making.

It took some time, but after some adjusting got a good idle so went for a drive.
Drives good, works just like it should. Tho it's possible that I advanced the cam a little too much now, meaning the engine feels VERY torquish now. But it's so slippery now that I have to wait for spring/summer to tune the engine finally.