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Power Enterprises is about the only bearing maker I know of that makes stuff that's "better" than stock (it's a different design and I'm not sold on it myself, but I've seen 1000+HP 2JZ's run them fine).
King is known to be, well, crap. At least in the other car circles I've run in.
Factory is usually more fine tuned than aftermarket (having more size variations to get the clearances spot on). On many other cars they're the go-to for the best available, and usually only not used because of cost or availability.
Keep in mind we're talking about hydrostatic bearings here, there's no real "wear" or contact taking place here. Generally if they're a crap bearing, they're not consistent in size and construction, as they're really only shims in such a system. Therefore, any failure is more likely due to other issues (detonation hammering them, oil getting too hot/thin, etc)
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