You need a new radiator anyway so get a cheaper and easier to find turbo radiator, buy some hose to reach the reservoir and source a shroud from the pick-n-pull. You might even find a radiator at the pick-n-pull. Bring a hand pump and bicycle inner tube to test it.

[edit] If your car doesn't have a separate reservoir, cap the fitting on the turbo radiator.

Sixto
87 300D