[macdave69]

Nah you don't want an 800hp Hyabusa that would be STUPID.
Chris' car has its roots set in the 60's. Bolting a lightweight multivalve, fuel injected, sequentially geared engine into the back would be historically wrong. Also at a time when British Engineering was at the forefront of R&D and a time when we were still a little sore at the Japanese for causing a bit of a fuss two decades earlier , bolting any product of the rising sun would be ethically and Culturally wrong.

So what are the options, Supercharged A series, nah, been done. Hilman Imp/ Coventry Climax, too unreliable when tuned. T160 Trident engine, replete with Norman Hyde heads and cams, possible but tickling the carbs would be quite tedious and these engines are getting a bit hard to find.

Nope what you need, and you can make these at home (try google)
A Gas Turbine Engine. Developed by pioneering English Inventors in the Fifities and sixties, with Slide rules, log table and a lathe, capable of 1000lbs of thrust and run on paraffin, therefore excise exempt.
There you have it cutlurally, historically, environmentally correct and can be built at home, how Locost is that!!!