This didn't happen to me, but to a friend who was selling his 260c.i. V8 powered 100/6:
Couple of 'know-all' blokes turn up to inspect the Healey but are disgusted to find the car had been modified. My friend Rick explained that the conversion had been done in such a way that reverting to Austin power would be straightforward. He even had a six cylinder engine to go with the sale. They weren't impressed and as they left, Rick overheard their conversation:
"Fancy doing that to such a beautiful English sports car" says bloke one.
"That's nothin" says bloke two "you should see what he's done to the other one".
Alongside the V8 powered six in Rick's garage was his 100S (3909)!