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The '75-'77 911S had larger port (35mm) and a more aggressive cams than the normal 2.7 911CIS of that period. All CIS cams are fairly mild though. The '77-'78 2.7 also had the oil bypass mod and the larger oil pump, so it's a perfect starting point for a really hot engine. Unfortunately, you live in the land of smog tests and bad gas, so you may have to keep it CIS and low compression.
I can assure you that an S-cam, high compression, Weber carbed version of that engine would be a real screamer. Just changing to Webers would be an improvement, but I doubt you would pass smog, and it may not be legal either.
Good luck,
JP
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