Yep I still looking B28. I have to check my notes and get back to you about you B28. But I can tell you that most likely she did not come with the 2 cylinder Westerbeke Diesel Engine. I think most of the B 28 start out with Atomic 4 Gas engines.
You Hin would make you B28 the 18th Hull. But I don't think Bristol was very accurate with the Hull numbers. As To day I oly found or 8 B28's
If you get on FB check out the Bristol Group https://www.facebook.com/groups/52017206405/
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