Your idle speed is high because you are advancing the timing at idle by using the vacuum advance with manifold vacuum! Try this- set your idle speedscrews to expose the transfer slot(s) so they are square as they say, put themon the engine and fire it up and let it warm up, then measure your...
i think this is the best idea i have read about so far- you would never walk out of the bank with cash yet you would be 100 percent sure that the transfer is legit- this is the way ill do it for anything over a few thousand dollars.