Just did 2 to 4 bbl swap car starts wont stay running please help

take the spacer off. plug your pcv. plug the intake vacuum port. make sure all vacuum ports are plugged on the carb. make sure the idle screw is against and moving the throttle. make sure your mixture screws are a 1 1/2 out or so. make sure you have fuel.make sure the choke is open ,fire it up, keep it running and then start tuning and the add your spacers and what nots.