I also vote for keeping it original. There's a following out there for Grant Peterson's work, and you may regret it in a few years if you change it.
I'm not certain this link will work:
http://cgi.ebay.com/ws/eBayISAPI.dll...sPageName=WDVW
But it shows a recently completed 1991 MB-0 sale on Ebay where the bike went for $1,125 (!).
Who says those Bridgestones weren't a good long term investment...