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JZ engines are old and heavy. I think with the exception of another boxer lump, pretty much any engine swap would ruin all the hard work Toyota and Subaru have put into this car's handling.
With the JZ in particular its a cast block which would be way too heavy to properly use in the FT86.
You'd be much better of just buying the turbo model ft86 (if they produce one or a upgrade kit to fit to the N/A) or swapping in the Impreza Turbo lump.
The only benefit i can see in having something like a 1JZ/2JZ is the torque....but torque of that scale would be wasted on a car like this as its too light. You'd struggle to get any power down as there just wont be enough weight over the rear axel.
2.5ltr Impreza STI lump would be the biggest engine i would ever consider putting into this car.
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