Back fire through carb on throttle

TT5.9mag said
Why are you afraid of it? Turn the idle stop screw in 3 or 4 turns, get the damn thing to run and warm up, then adjust it down, and adjust the mixture screws for best idle. Seems like you’re hesitating for some reason. With full fuel bowls it will run for 30 seconds to a minute at low rpm and then die. Get a good source of fuel to it so you can run it longer. And plug off all vacuum stuff for now. You don’t need to worry about that crap. VA can come later in the conversation.

Ya I don’t want anymore backfires so I’m slowing down and trying to be more methodical. I did increase the idle and that’s helped. Next step is to hook up an electric fuel pump attached to a gas can. I’m disconnecting the PVC and plugging that hole. All also adjust the idle mixture. If the engine then runs long enough to warm up a bit I’ll try the throttle again. We are aligned .