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May I be the first to say, "yummy!" If you add cams to this and fart with the pistons so your CR is in check, this could be a beast of a setup!
The main enemies to engine longevity with N2O are cheap-ass systems. You want one that provides good cylinder-to-cylinder AFR. If you have a single-point nitrous and fuel injection, then that's the worst-case for cylinder-to-cylinder AFR differences. Fuel doesn't round corners as well as air/nitrous does, so the cylinders with a more "torturous" route from the nozzle to the intake valve will receive less fuel and the same amount of air/nitrous.
Then, you want an EMS that's smart enough to add fuel and remove timing. I'm sure you already know this, but only doing one or the other won't cut it.
I admit, I haven't tuned any nitrous systems either, but I'm sure it's like forced induction. You start with targets you know are safe and work your way to more agressive settings until you hear trace knock, then back off. Pulling 2-3 degrees of timing and leaving the AFR 11.5 or richer is probably a decent starting point.
Of course, you always need to watch temps! Start with a lower shot count so you aren't tempting fate until you have some experience with it.
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