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ok, I know this is probably a dumb question, but have you changed the sending unit for your coolant temp?
Also, if you go aftermarket temp guage, don't replace the stock one with the aftermarket sender. The computer needs input on your temp (via the stock sender) to calculate advanced modifiers on many things, to name a few: Fueling, transmission shift points/pressure, fan on/off times, etc.
Welcome to the land of the boosted, and good luck.
Also, I will confirm that the stock internals are not forged. The pistons and crank are both cast, and the rods are merely shot-peened, and even the cam is cast core. However, I've run as much as 18psi intermittently on completely stock internals, and finally blew a piston due to fuel starvation in an altitude change.
If you want forged, like the others said, go 3500 crank (~2,500 new, and will require retooling for crank position sensor), SBC 5.700" small journal forged rods (side clearanced) ~$300-400 w/2 extras, and a custom set of forged pistons (~$600-800 per set).
Sky's the limit (or your wallet, which ever empties first).
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