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A stock SR will have no problems, provided you properly set up the cooling system. That means an SR-specific radiator with the inlet on the driver's side (stock JDM is fine), stock fan and fan shroud. Other than that, those engines have no issues with heat and stress at stock pressure.
If you're concerned about worn suspension wear making the car unstable, based on personal experience, subframe spacers and tension rods make the biggest differences on a tired car. If your brother doesn't have much track experience, when you replace the struts and springs, stick with something soft but balanced like Whiteline springs. The rates are only 50% higher than stock so weight transfer will still be easily felt, but the car will be nicely more aggressive (and not sagging). Match with KYB AGX and set the dampers where you feel comfortable.
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