I have a whistle at around 900-1000 RPM, right about where the idle is set on the Dart. Anyone ever ran into this? It is pretty loud.

I am going to take a propane tank and move it around the carb to see if there are any vacuum leaks.

Also when tuning I adjust the idle mixture screws to get the best vacuum, however I could not kill the engine either going in or out. There didn't seem to be too much adjustment in them, but the car would run rougher, with less vacuum in both directions. Is it possibly I am into the primary circuit? Stock cam, initial timing at 18 degrees, vacuum advance on manifold vacuum adding 18-20 more degrees at idle/cruise.

In general, after the tuning yesterday the car is running *much* better. Before I would hit around 3K (not running it hard) and could hear the engine break up a little like too much advance.