I have repaired the original 4 core radiator on my '65 GTO/389. I've also replaced all hoses, radiator and heater, and replaced the water pump gasket and thermostat. My question is how's the best way to burp all the air out of the system? I'm using distilled water and since there may be major spillage on my garage floor... I'd like to top it off with anti-freeze as the last step to prevent a mess on the floor and not waste anti-freeze.