700whp is debatably within the realm of stock engine reliability, depending on how much you actually use it at that power and what you used it for. In the typical Z project setup, 700whp usually cannot be put to the pavement. So even after making that on the dyno, you wont generally replicate that type of load unless doing 4th gear + pulls.
IMHO, I would skip the engine build. Too much trouble and expense, too much room for error. I would take all the money I save and just do an all-premium stock engine setup. Maybe grab a backup low miles stock engine to keep in the corner of the garage, ready and waiting for a weekend swap should the original engine ever fail. Set it up to run 600whp daily (which will already roast the tires 99% of the time you try it below 60mph), and have a 675-700whp high power mode for occasional use when it counts.
When your goal is balancing on the tipping point like that, in my opinion, it makes a lot more sense to just dial it back a tiny bit and spare yourself a TON of money and drama over the built engine lifestyle.
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