Lars,
I've been building up the old Holley List 6211 carb and posted in the engine section. I have a couple of tuning questions.
I installed 4.5 power valves as you recommended in another post. installed #64 jets in primary but the largest jets I had for the secondary was #84 so I went with them for now. After swapping over the metering plates and base plate from a newer 6210 and reassembled the carb. The thing started right up and no leaks. The previous rich issue is gone and I'm real pleased so far.
I found out that the secondary idle is too high as the primary idle will only go down to 1000rpm and if I push a bit on the secondary it drops a bit more. I adjusted the secondary to where there is 10th of transfer slot showing. Should adjust the secondary idle so that the slot is just hidden by the butterfly as the next place to start?