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I'm not any kind of dyno expert, but if 204 was the max you saw with all the changes made I would suspect somethings amiss. We routinely make over 60 hp with a 650 cc single air cooled motor; two valve head, not as much cam and smaller induction than what we are doing with the 911 motor. I know it adds up to a 3.9 liter motor but it also adds up to 360 HP or 90 HP per liter. My guess is that 270 FWHP is not hard to do especially with 46 mm Webers, almost .5" lift cam and 10.5 to 1 compression. It's an air pump not unlike many others.
The biggest caveat; it will have to rev.
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