A fast way to check for vacuum leaks is to get a can of carb cleaner. Put the extended nozzle on it. Then spray around the hoses and carb base plate. If the idle picks up you found a leak. (You will find an idle increase around the carb throttle shafts real bad on a rochester carb). Also spray around the shaft for the power brake booster inside the cab. Power Brake boosters are known to start leaking there also.
bigblue I am like you. Holley all the way on a gas motor. Don't use a holley projection unit. Been there done that.
