Here's what I see. Your dashpot/idle stop solenoid is unplugged for some reason. There should be a little single wire connector that plugs into that prong. What that does is whenever you turn the A/C on, that bolt head nudges against the throttle arm to compensate for compressor load whenever it's idling. It is adjustable, by the way. I can't get a good look, but something doesn't look right with the choke pulloff tube. That should be going into the carb not somewhere else. The retainer clip for the detent cable is missing so you need one of those so it doesn't fall off. Your EGR valve is unplugged for some reason. Not a big deal, but I thought I'd mention it. I'm assuming that the valve got stuck open or couldn't hold vacuum, and it caused it to run poorly so they just unplugged it and sorta plugged the port. I see some half ass plugging of the vacuum ports and what looks like gray RTV around part of the edge, but I could be wrong on that. If so, that's not good. The carb should only have two bolts, though. What I'd do is just pull the carb, get a set of vacuum caps, get a new base gasket for a Rochester 2GV, and get a new fuel filter. You need to correctly plug the ports that were plugged with bolts, reconnect the pulloff tube to the carb, undo that flare fitting and big nut to get to the filter and replace it, make sure the intake is perfectly clean before you reinstall (if you have to scrape, do so very gently and wipe clean with a solvent such as carb cleaner - do the same for the base of the carb but don't scrape at it), and bolt it down snug in a diagonal pattern. Don't over tighten it. I would like to know what emissions components have been deleted, and where the remaining vacuum lines go to from the carb. What did you mean when you said it stays open? Are you saying the choke is open when it's cold? If so, I'll attach a video that shows how to adjust the choke and fast idle on a 2GV. I wish I could help more. I know some about these carbs only because they're Rochesters, but I know plenty more about Quadrajets. If it doesn't work out for you, I'd swap intakes, throw a nice remanufactured Q-Jet on there, and be done with it.
Here's what a properly connected choke pulloff looks like. And that video was for a 2GC. Let me see if I can find something appropriate.
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Better let someone who's familiar with these supplement on the adjustment parameters. Another issue could possibly be that thermostat that controls the choke.
