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can a 4g63 handle high boost all the time on stock internals?
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That really depends on the turbo and the hp you are making. Really large turbos like the BR580 I would say 18psi is the most you would want to run on pump gas on stock internals. I have a Super 20G and I can run 23psi all day long on pump gas and 28+ on stock internals. Really what it boils down to is hp, the more hp you put on the stock 2G rods the more of a risk you have of damage to the engine. There is a guy here in STL who ran right around 450hp on the stock internals on a 2G. I have heard the 1G big rods are more stable for higher hp applications. The general consensus about 2G 4G63s is that you don't want to run much over 400hp on the stock internals.