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Drive it hard. Every new car and especially motorcycles get broken in hard at factories. Also any crate engine you buy is usually thrown on an engine dyno prior to shipping where they run it for hours at various loads.
Also since the SR20det is technically a flat tappet engine you have to run the engine hard on break in or you risk wiping out the cams. The oil rails for the cam shaft do not flow an adequate amount of oil at idle or low RPM, you should at least start the car and have it idle at about 2000 RPM and vary the RPM from 2-3000 and let the car come up to temp. After that set the idle back down and drive it hard, if something is going to break from improper installation it's going to break driving the car hard or soft.
A properly built engine can go from assembly room to the dyno doing 9k pulls in the same day no problem, the theory of soft break ins comes from factory service manuals having to put it in to avoid liability because if they said "So hey in order for everything in the engine to seal correctly we're gonna need you to pull it to redline and do some highway pulls" there'd be even more wrecked mustangs and looped sport bikes than we already have, so instead the factory does all the fun work for you and hands you a book that says "Go easy on it or else" basically to avoid you sliding into the traffic pole down the street.
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