Back when they were almost new, nobody thought of Tigers as being super valuable in the future. So if someone got a good deal on a wrecked Tiger and then never got around to fixing it, or just bought it for parts and the engine, I could see it finding it's way into another vehicle. Even back in that time frame.
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Another potential source if into on the engine would be the Tiger clubs, or forums. They've been digging into this stuff longer than we've been digging into Bronco lore, so may have a line on information from the plant in England. Worth checking out for sure.
Maybe they can open up a world of info just from the engine tag.
Paul
It would be super cool, but not from england!
Again, too much clues!!!