[bkozlow]

Hose below the cap goes to over flow to ground on the original, recommend going to a catch (expansion over flow) can so you can have a vacuum refill of the system as it cools. 1968 Mustang windshield washer fluid container makes a nice neet overflow container. Tap it in the bottom as the fill and plumb the top as the over flow to the ground. Next fitting on the tank is used as the air bleed for the radiator. Run it to a fitting on the top of the radiator. Botton (large fitting) is the fill. Run the line to the hard line between the radiator and the water pump (lower radiator line).

Bill K