do you know for sure that it is overheating? I mean are you using a laser thermometer to check the temp at the radiator? I had an issue with my 86 where the guage said it was HOT but it was perfectly fine. I replaced everything that you just mentioned, including the radiator and it turned out to be the guage... 
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2010 Camaro 2SS, Inferno Orange, black stripes, Inferno Orange leather interior, RS package, 21" black rims, 6 speed manual trans, Inferno Orange engine cover.
1984 Trans Am Roadster, 305H.O, 31k original miles, all original.
1984 Camaro Z28 Roadster, 350 .40 over, cam, edelbrock 750, headers, flowmaster, more to come...
1986 IROC-Z, L98 swap, .30 over, forged internals, cam, headers, flowmaster, Go Fast juice.. - Sold 
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