Cooling issues, could use some advice

are the headers coated?

Maybe look into waterless fluids like Evans NPG + Coolant. They are allow the engine to run at higher temps with almost no increase in pressure of the cooling system. The fluid has a higher boiling point then water so i doesn't make steam that pressurizes the cooling system.

It is a little expensive but can be run for 30 years.

[ame="http://www.youtube.com/watch?v=VkNz-ANfUkc"]http://www.youtube.com/watch?v=VkNz-ANfUkc[/ame]