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For 300-350 horsepower, building the KA would be the best choice. It would be significantly cheaper than swapping a 2JZ.
Depending on where you buy it, and what you're looking for, the 2JZ can cost anywhere from 6-7 thousand for just the engine. With the same amount of cash, you could fund 90% of your KA build: suspension, brakes, cam, turbo kit, engine rebuild kit..ETC.
If you're really set on a "badass" swap, I would suggest an SR20. They're cheaper to swap ($2-4,000 for engine), and achieves 300 horsepower with a few more pounds of boost than stock.
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