the breather tank on the back by the firewall is for
oil vapors and allows for less build up of crank case presures (427 comp cars also have them), not for "pcv" purposes as the
oil is not introduced into the combustion chamber or intake system. the weber intake ("cobra" style) has 2 outlets that connect via hoses to a "y" pipe that goes to the radiator. the radiator tank has a 2 pipes that connect to the radiator overflow (small dia.) and to the heater connection on the water pump (large dia.). there is a weber manifold out there that ford made for the 289 gt40's that has a thermostat and normal outlet to the radiator.