those numbers sem right to me....i dyno'ed 269hp/274torque on my 97 vert with 94k on it.....for the most part my car is very close to stock with the only mods being......bbk h-pipe, flowmaster 2 chambers, adjustable fuel pressure regulator, 80mm mass air.........and...thats about it....i thought my numbers were pretty good considering the mileage on my car....so yeah i think your numbers are right were they should be......
steve