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Since the O2 sensor is being used at idle and low speeds I would think it would be around 14.7 . I never measured mine but do know it hunts (trying to keep at 14.7 ) at idle and up as long as part throttle . could it be a issue with EGR , I always had to clean mine as it would get stuck closed with gum/buildup . maybe yours is slightly open .
I can believe they ran rich though , I know I messed around with calibration spring (under the plastic top cover of MAF) . tightening the spring up a click or two gave it much better response but since I didn't know what was happening across rpm band I always kept it stock .
One thing be careful those motors the rods are not strong and easy to bend ,that is if you start raising boost to like 17+ lb. I would keep it low like 12-14 range for heavy vehicle .
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