My 72 450SL radiator was corroded and starting to leak. At that age and condition it is definetely time to recore or replace unless the car isnm't worth keeping for long. The cooling system is one place I don't like to cut corners since cooling system failure often leads to disastor for the engine. I had mine boiled, recored and paited at a top notch shop called Reseda Radiator (Reseda, CA) for $250 plus tax.

If you have a 6cyl maybe the radiator is smaller than mine and could be a bit cheaper? Also I think prices tend to be higgher here in the LA area compared to OK.

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1972 450SL
1982 300D Turbo