I don't think I want the motorcycle engine. . .they trade off in RPM for displacement is a trade off for flow efficiency for weight.
The moto engine will be lighter, but it will get worse gas mileage.
Also. . .I doubt I can find a motorcycle engine with comparable power for the price. Less than a grand for all drive line components is pretty hard to beat with any sized engine and one that drops more than 160 horses and 137 lb-ft. is pretty impossible to get for less than 2.5 k. Even if there were fuel savings it would take forever to pay for that difference. Also the aftermarket parts to survive boost to attain the desired output I know are more expensive.
Moto engine would be way more expensive, to build and maintain, and less FE I am pretty sure.
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