Thermoquad idle issue

340, mild cam, idles at 11" @800rpm. Idle is hunting. float level has not been checked.Mixture screws are working and are set at 1.75 turns, with idle-timing of 22 *. No apparent vacuum leak.

If it was mine, this is what I would do;
I would verify that all hoses are in good shape and properly routed. I would , plug the supply hose to the booster, or pinch it closed hard. Next
I would go to post #11,I would remove the vacuum advance hose for now,and if the hunting persists, I would go to post #13. If the pistons are both stuck down all the way and not dancing, then I would make sure the secondary butterfly is fully closed but not sticking.
If the hunting persists;
I would back the idle timing down to 12/14. I would return the idle speed to 750. I would adjust the mixture screws to 2.5 turns. I would flip out the PCV,seal the engine, and put a vacuum gauge on the dipstick tube.By now the engine should be fully warmed up. Readjust the mixture screws as may be required.And the hunting should be gone.
But if the hunting persists;
As to the vacuum gauge on the dipstick tube. There better not be any vacuum in the crankcase with the pcv valve out and flipped out of the way, and the engine sealed. Cuz, that would indicate that the intake is sucking air from the valley. That would have to be fixed. But if there is no vacuum under the intake, then
If the hunting persists;
I would pinch closed a rubber supply line between the pump and the carb. All the way closed. Then I would wait. And Wait. And Wait.
As the fuel level in the float bowls falls, one of three things is gonna happen;
1) The idle speed will stay the same for a while then slow down and soon stall.
2) The idle speed will rise for a while,plateau for a while then continue as in 1)
3) The idle speed will immediately begin to slow down and soon stall.

1) is what you want.
2) says the fuel level is too high, pull-over is too easy and the engine is idling rich.
3) says the fuel level is low, and the low-speed circuit is struggling to get fuel.
If you get a 2 or a 3, you will have to check the float level setting. If the float level setting is correct, then I would change it up or down as required up to 1/16 to 3/32 and retry. If this doesn't improve a 2 or a 3 to a 1, then the low-speed circuit will need to be looked at more in-depth.
If the hunting persists;
If the hunting persists, the engine may be possessed of the devil; I would call a priest who is well versed in removing demons. There may be prayer and fasting involved. I am 212 pounds so, this may actually do me some good.