You might put a small tyrap, 4", on the secondary diaphargm shaft and butt it against the body.
Then when you go test the secondary opening, return to the garage, check for distance between the body and the tyrap to see if secondaries actually open(ed). Look for movement of 1/4-5/16 inch.
You will need alot of engine load, or a condo cruiser (heavy car, i.e., Impala, Caprice, Buick Park Avenue, Olds 98, etc.).
With 9" of vacuum at idle, you either have a crummy running engine or not a stock cammed engine. It will take some fine tunng to make this 1850 work. Use a feeler gauge to open the secondaries, at the setscrew by the diaphargm shaft. This will allow the primaries to close further, thus allowing the idle mixture screws to do their intended function. After adjusting for best tidle, measure the height of the secondary shaft bracket and turn setscrew to this new height. Sometimes if you remove the setscrew and install from the top, this helps to do adjustment
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