BTW, the MB-1 was a pretty expensive bike in its day. The 1985 MSRP sheet I have gives it's price as $520. My 400, which was about the mid-level of their road bikes, listed for only $250 so the MB-1 was over twice as much.

You might want to post this in the Classic & Vintage forum too. Bridgestones are highly thought of and you might get some leads on parts, etc over there.