[Barnsnake]

The item you linked to is just a catch can. You could use it as a recovery tank by mounting it upside down, plumbing the radiator overflow to the bottom, and leaving the petcock open as a vent. The downside is that you can't see the level and you can't easily add coolant to the recovery tank.

Use of a recovery tank is handy in a cobra to help keep the air out of the system. Since the top of the radiator is lower than some parts of the engine cooling system, if you are overflowing at the radiator cap it will systematically pump coolant out until there is air everywhere above the radiator cap. Use of a high mounted "surge tank" is one way to address the problem, but a recovery tank is the most effective at keeping air out of the system.