ive only ran the truck 1 time. got a 15.9@82-83 in the 1/4. the 4.3's have plenty of power jus the wrong gearing i guess. i watched a 95-96 gt dyno at a shop here in augusta that had exhaust, intake and a chip. i put down more hp and he outdid me on tq by like 30ft lbs. had the truck dynoed with it completely stock (had intake, then took it off) and came up with 178hp/212tq.