Check it's getting full throttle.
Fit stock cam pulleys and pin it up, that will get the cam timing close enough to eliminate that variable.
If that doesn't fix it, take the lambda bung out and do a pressure test while doing a power run; if it's more than about 3 psi your exhaust is no good.
If that's OK get someone else to dyno it, check the power, fueling, ignition timing (actually measure it, under full load at high rpm- it will want to be around 24 degrees)
Check the timing on all cylinders, because with a megajunk ECU you never really know what is happening.
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