Well I spent the past hour and a half messing with the truck. Checked voltage to coil at idle, 12V we're good there. Disconnected and plugged both the PCV and brake booster at the carb/intake, no change. Removed idle mixture screws, blew them out with carb cleaner then reinstalled screws and adjusted idle mixture, again no change. I also (carefully) sprayed carb cleaner around the base of the carb, nothing. One thing I've noticed is it always seems to get worse once the engine is warmed up.
I think the only thing left is the cam which if I do have to replace it isn't going to happen for at least a few months, I need this truck and don't have the time to dive into the engine yet again.
Here's a video of how it runs. I forgot to hook up a vacuum gauge but you can guess what it would be like; I've hooked one up before and it reads normal then drops 3 in-Hg or so and fluctuates quite a bit when it starts "chugging".
