I know its a B body, but what's it worth??

Looks nice! If its something you really want, and not worried about the resale (sounds like its sentimental to ya) and your planning on keeping it, then you will be able to pay the high side of the market if necessary. It's your money, your desire, and only you can say what it's worth to you. The only way you can really pay too much is if you think you might sell it one day, or if your budget is limited. Other than that, its paper for a car! :)