MGB Engine value?

[culminator]

I have a standard 1800 engine going spare, which I took out of my roadster. I won't be using it as I'm building an FIA car and thought the original engine was too good to strip and rebuild. So, I'll be selling it on but don't know what its worth.

It was rebuilt 7000 miles ago by Ivor Searle, although it was quite a few years ago. It ran perfectly before coming out and would be great for someone that wanted to save on rebuild costs. It probably needs a good clean up though.

Got to be worth £200-£300? ???

Thanks
Mike