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I highly doubt your stock radiator is going to be the issue.
The coolant overflow tank is there to account for the expansion/contraction of the fluid when it heats up it expands and bleeds past the pressure regulating valve (aka the radiator cap). When the coolant cools, it contracts and "sucks" back into the cooling system to keep air from entering instead. That is why there is a minimum water level mark on the reservoir. Overheating has nothing to do with the coolant reservoir unless it is empty.
By stuffed I mean f**ked. I'm not saying the hg is damaged, but it might not be sealing the coolant passages from the cylinders and allowing exhaust gases into the cooling system. What did you do for block and head prep before installing the PE gasket?
And if you take the radiator cap off when the coolant is hot, of course it is going to bubble up and boil out because the pressure is what is keeping the coolant in liquid form. Remember the science experiment in HS where your teacher made water boil at room temp in a vacuum chamber? Same principle applies here. When the pressure is reduced, the coolant wants to boil.
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