Who knows 2 barrel carbs ?

blow through the 'ported' vacuum port, you should be able to blow out somewhere, ideally right above the throttle plate. here is some info from a jeep board and a BBD
On the Stock Carter BBD or Carter-Weber BBD like mine, the drivers side back corner nipple goes to the air filter TAC (hot air flaps). The big driver's side port on the bottom goes to the power brakes. The center back big one goes to the PCV with a T fitting for the canister purge. If you have a solenoid on this line, toss it as a recall, only leave the T for the canister purge. Back passenger side to choke pull off. The valve cover side center goes to the distributor. It 'can' T for the CTO feed 'or'.. The front drivers side corner one goes to the CTO valve. From the CTO, a line goes to the canister purge signal 'and/or' one can be fed off this purge line to the air filter TVS and from there to the EGR.