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78-79 cis& heads vs. 82

Engine

Vehicle Information: Model: 911sc; Year: 1982; Body Type: Coupe; Total Mileage: 150;

Thank you for getting back to meI have read of a benefit of 78-79 heads and orcis.Is it the intake runners.I checked valve sizes for 78-79. They are the same as 82. Where is the gain? Can I change it and be stock in pca racing? It sounds like the weak link for me is on the intake side. How can I improve this. Also someone is telling me cis pistons are going to be needed (unique shape)Is this true? I'm looking for 9.8 I understand this is euro-spec?

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