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With a WRX I/C, how much can I push my engine??? Please keep in mind, I have an Auto!

I have an opertunity to fit a STI v7 engine in my 92 Legacy. If I keep my auto tranny, will the new engine blow the auto tranny?

I've been told by Subaru never to run the car in 2wd mode. It is strictly for towing purposes, and can damage your tranny. Subaru doesn't even recommend using it for that either, strictly get a flatbed.

I own a 92 Legacy Turbo AWD 4 door Sedan (Automatic) (2.2 engine) I was told for performance, I can upgrade the following to WRX parts: - Fuel Injectors - Headers - Fuel Pump - Fuel Regulator - Intercooler 1) Will these parts intermingle 2) Will I blow my auto tranny as a result of increasing HP. 3) Is it worth the price??? Thanks!