my dad has a kenne bell supercharged 85 gt with an 89 mass air motor. we have a mechanic friend who we thought was really good and reliable do headgaskets, and he turned out to be flakey, forgot to do stupid things while reassembling (ex: pcv valve before blower was bolted down...took him 6 hours to get it back on with blower installed and charged us for it, had exhaust leak when headers put back on, acted like we would live with it or fix it ourselves