The Bristol 28 I purchased did not have a HIN. I did learn that this boat was hull number 10. The year of this boat was 1972 vice 74 as I had previously stated. So there is some misinformation somewhere as the hull numbers do not correlate.
The Farymann diesel is a well built sturdy little engine. I am concerned however that the watersides may be somewhat corroded. Since this is also the original engine, although still running, it is past its intended lifespan. I plan on removing and rebuilding the engine and installing it on a little work boat that I use in the bay. Parts are still available on line - I also believe there may be a new complete engine available on e-bay for about 3.5K.
My advice, if you are really interested in the boat, would be to offer 5K depending on the outcome of a survey. I bought, and still own, a Kettenburg 41 for 25K when it was listed for 45K and it had a brand new Yanmar diesel installed.
Good luck on you boat search,