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Once the engine is assembled and a starter is hooked up, run a dynamic compression test and divide the result for each cylinder by 14.7, that will give you the exact compression ratio for each cylinder. Average all six for the engine compression ratio. A compression ration of 9.8:1 should give compression results of 9.8 times 14.7 = 144 psi.
I suspect that the result will be a little low if the compression rings are not broken in, so you might recheck at 1000 miles or so, just to verify the compression.
If you want to be really accurate, you can divide by the atmospheric pressure on the day you run the test.
One atmosphere at sea level averages 14.7 psi = 29.92 inches of mercury = 760 mm of mercury = 760 torr = 1013.25 millibar. Your local weather service will report barometric pressure in one of these units.
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