White smoke coming from carburetor/exhaust

[Black66]

My 66 C10 has a 350 SBC in it and a Holley 650 double pumper carb. It ran fine the other day then I tried starting it today and it has very rough idle and won't stay running. If I don't have it choked at least half way and let it idle, it will idle very roughly and eventually stall. I checked the exhaust and there's thin, whispy white smoke coming from it and it does smell like gas. I popped the hood, took off the air filter and there was a bunch of smoke coming from the carb. I took a video and could upload it to youtube if that would help.

The needle on the primary bowl had a worn o-ring so I bought new ones from Holley and they should arrive later today. Some gas does come out of that set screw in the front that's on top of the needle and I heard that could cause flooding? I set the floats to the levels in the Holley manual. I haven't done anything with the two black screws on either side that control lean/rich adjustment yet.

Any help would be appreciated!