| The stock N/A differential isn't going to last long on 600whp. I believe Ztunerz toasted his N/A diff with 550ft/lbs... you can read about it here: [ http://www.twinturbo.net/nissan/300zx/forums/general/view/2178694/Finally-found-the-limits-of-a-NA-rear-end-.html ] The fact you say a stock TT isn't that much faster than an N/A is off. A stock TT is considerably faster than a N/A, even an N/A with some mods. I think you would be hardpressed to be disappointed in a swap that had some mods (maybe turbo-back exhaust, intake, and ECU) coming from the N/A platform. It's your choice! Good luck! I'd go with the pristine Z > TT swap ;)
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