There's no reason that a Shimano BB of that vintage should be noisy when new. My guess is that your creaking noise is coming from something else - seatpost, stem, etc. There are lengthy threads on other bike forums about mysterious noises and what eliminated them. I'm guessing that you have one of the Coda cranks. Best way to be sure of getting the right replacement BB is to pull the old one, check the model and measure the spindle length.