4 Barrol Carb.

It is idling too fast because the fast idle cam is on and you need an electric choke signal to heat up and thus slow down the fast idle speed. You need to wire an electric choke system, if there is not one already there. As for it running on only 2 barrels, that is normal for around town driving. The secondaries ( the other 2 barrels) should only kick in when you floor the gas pedal. As for the vacuum hoses there should be an under hood label that has a vacuum diagram for you, or go to the store where you purchased the carb, instructions should have come with the carb.