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First off,
I really don't think you can go wrong in either option. Each motor is very proven. Everyone has their pro/con story to each motor. I personally have a bias towards the 1JZ, simply because that motor is my power plant of choice after much research.
Some of the reasons why I chose a 1JZ swap:
- Cast Block.
- Forged Bottom End.
- The R154.
Also, with the motor in stock form, 500 horsepower is very attainable, yet safe.
There was a local dude who swapped a RB25 into his Z32, and ran into many problems. Most of those issues were cooling related. If you can successfully keep either of these motors cool, I really don't think you can go wrong.
Edit: If the S and Z Chassis front crossmembers are interchangeable a 1JZ swap seems to be much more facilitated. I'd be very curious to see.
Good Luck. Look forward to a build thread documenting this.
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