Nitrous will work fine with the Q-jet. A plate system will create extra vacuum under the carb, which will help pull fuel out of it by increasing the signal to the boosters. It will actually also help open the secondary airflap quicker, but you shouldn't need to adjust it to slow it down. You'll be throwing so much extra fuel at it with all of the artificial O2 that it won't matter.
Play it safe and pull 2 degrees of timing out for every 50-HP of nitrous. Keep tabs on fuel delivery and pressure (follow NOS guidelines to play it safe). Read the plugs after every run, and if spraying more than 150-175, drop to the next coldest heat range.
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