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Do some research on cooling system design. Simple things like a overflow/recovery tank, proper radiator cap, fill port location, etc, can really make a big differance.
Replace the radiator with a quality piece, like a Moroso high flow. If the engine has a carb, use 180*. Drill a 3/16" hole in it to allow the system to be self burping.
But one comment did catch my attention. "..after it cools down I need to add some more coolant." Why is that? it's a closed system. Unless you've recently drained it, you should be losing an apreciable amount of fluid. Makes me wonder about the head gaskets. Take it to a shop that can check the fluid for products of combustion.
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