5500 might be where the cam manufacturer says it will stop making power, it's not where it will spin too. Never put a chip in an MSD that is the number you want. They consistently pull signal starting about 300 rpm before the actual number.
Like MikeDevore says, put a 6500 chip in it and run it. If it was banging the chip for 100+ feet, that's a lot of lost ET and MPH.
