What causes "dieseling"

str12-340 said

This kind of add-on is just what I need on one of my carbs on a 2.2 with run on issues. Does someone make a retro fit piece that closes the carb tight when you shut off the switch?

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I do not know if there are retro fit kits. Look at auto parts for a replacement for a 70's car. The throttle does not need to be closed tight when the solenoid is de energized, just say 150RPM less should do it. Your energized idle is set with the push rod on the solenoid.
Summit has some. I saw one listed for a Camaro, so probably a V8.
Amazon also has a bunch listed.
Some the body had a thread that screwed through the mount bracket and locked with a jam nut. Just find one that looks like you can make it work.