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You'll never get an exact percentage from a book/written down as your gearbox may be more or less worn than another 172 gearbox.
You'd have to put your engine on an engine dyno, then run it on an accurate rolling road and calculate the difference.
Yeah but in my case, I'd stick a Rover T-16 into the ZR. I highly doubt Nanjing in China will send a letter confirming an engine built about 15 years before they bought the rights to MG-R lol.
Hell, I bet a lot of DIY engine conversions are done by people who are just as competent, if not more...