I would say something just isn't right. Even for a low hp car your numbers are way too low,even for my dyno.
First check would be tuning. I think it was said to be tuned full sd with no MAF? If true, that is absolutely not needed and could be the problem.
Second- work done to car. Cam degree'd right? Preload on the lifters correct?
That is a few things that come to mind.
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