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I purchased my 1979 SC with zero miles on a rebuild exactly as you describe. Mine is a 1979 ROW Carrera SC, the previous owner was going to rebuild the engine as a result of broken head studs. When he priced brand new piston and cylinder sets, he shifted gears and bought a very low mileage P&C set from a 1982 SC.
He had the rotating assembly balanced, rebuilt the heads, and had the ports polished. It has 964 cams. I broke it in and recently added SSI's with a Dansk 2in/1out muffler.
The car runs incredibly. It pulls hard from any RPM, starts on the first try (cold or hot), runs at a steady 180 degrees, and has no problems with pump gas. At the moment I have no desire for more power. As long as it continues to run as it does now, I have no plans to change anything. If a NLA component of the CIS fails in the future, I'll probably convert to EFI, but as I said, I love this set up. I suggest it wholeheartedly. The increase in cost going to 9.8:1 is not worth the small increment in power you'll get by doing so.
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