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Search for TimZ on HZ for the thread.
Also, 720bhp and 760bhp are only a parasitic loss of 10% and ~15% each, which isn't that bad at all, especially using older gear boxes and rear ends that have looser tolerances than modern ones.
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I got How To Modify with my first S30, along with the FSM and How to Hotrod and Race your Datsun, from an 80 year old guy who had been modifying it and racing in SCCA since the 70's. They are all available on Amazon, of course.
I haven't seen similar books specific to the RB26, but if they exist I'd expect them to be Japanese, since Japan is where most of the cars with those engines are raced.