he might have put low comp pistons in it...low comp+no boost=slow...could be running rich too...get your self a turbo kit I say and get her boosted again....take that head off and see if there is stock slugs in it...if not you will have to boost it again...unless yu want to get yur cr up again...and that means rip her down... g/l and feel free to let us all help you through this...thats why we here brotha... rep points