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

turn up the idle enough to just keep it running. go under the hood with a bottle of water, and spray over all areas you worked on, once you find the leak with the spray, you will hear the engine rev up, as the water kinda blocks the leak for a second. i say the leak is at either the front or rear of the intake, where those garbage cork gaskets go