Are you sure it wasn't a V6 Camaro with 200hp? Wow! I know a 6-sp Z28 could do 0-60 in low 5's and 1/4 in about 14. An auto tested by Car and Driver still got 0-60 in 5.4, and 1/4 in 14.2. Your NA Z could do that? Maybe the other driver didn't know you were racing and didn't press on the gas enough.
Well, if you truly did that, then congrats.