There are a surprising amount of 2JZ's running 800 rwhp on stock internals. But one little mistake at that level and they usually put it back together with Forged Pistons at the very least.
That being said, your comparing a 2.6 liter world class motor to a 3.0 liter world class motor. You do the math.
I would think that if you were going to do something custom here in the states you would probably want to stick with the powerplant with the most support. That would be the 2JZ hands down.
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