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Sigurd,
No twin spark. The 9.5:1 compression will not require twin plugging. As far as the cylinder-to-head surface, no gasket is needed. The mating surface on the cylinders is slightly tapered for sealing purposes.
What are the specs on your build?
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-Jayson
1976 911S Signature Edition - 3.2SSt (JE 98mm 9.5:1 pistons, 964 Cams, Carrillo Rods, ARP Head Studs, AASCO Valvetrain, 3.2 Carrera Manifold, ID725's, B&B Headers, TS HyperGate45 Gen V, TS RacePort, BW S360, AEM Infinity 506, E85)
IG: Signature_911
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