That is good. When every thing is right the idle mixture screws should be 1.5 turns out and the idle stop 1-1.5 turns. Are you sure the there are no vacuum leaks from under the carburetor? Are you sure the timing marks on the balancer’s “0” mark line up with the pointer with #1
If the cam is new was it broken in correctly With the special grease?
Idle mixture screws are at 1.5 turns. I'll have to check idle stop screw, I just adjusted it to idle at 600-700 RPM.
I was thinking about leaks below the carburetor as well, but when I spray around with carb cleaner checking for leaks, I get no change in engine speed. Maybe I change my gaskets just to make sure. I could also replace the hose that goes from the carburetor riser to the PCV valve.
Timing marks on the balancer do line up at 0 when #1 is at TDC. I have set the timing to 10 degrees advanced in accordance with the shop manual.
I reused the old cam, but replaced the lifters. I coated all of the cam lobes and lifters in assembly lube prior to start up but no special grease. I've done no specific break in procedure since the rebuild, only idling and occasional throttling to check engine performance.
It might be worth noting, that I had my rocker arms adjusted WAY too tight initially and I tried to get the engine run in this condition repeatedly. I wonder if I caused damage to valvetrain components.