I am not a Qjet people. I do have a couple of carbs and a spare. They have a different config on the side than yours. I would look for the carb part # on the on the DS of the carb under the rear DS screw that holds on the cover. Maybe you can identify the car or truck it came off of. The 2003 Edelbrock Cat has a listing of part #s for trucks. Truck carbs are the most desirable??? Trucks have a different float in them. They don't lean up going up steep hills so they say.
Qjets were installed on most all GM cars and trucks before FI so there is a slim chance you will get any response on the dimension you are after. Good Luck.