what am i doing wrong?

Well if you're confident of your driving ability, go out there and let her rip :D Set your shift light to 6000 if you want to practice first or if you have a rev limiter set it to 6500. Just to be certain I'd ask him if the springs came in a kit with the cam, if not what are the specs of the springs he used and specs he installed them at. At least you'll have a little more peace of mind when you're out there racing.