Just because the cables are stretched doesn't mean it wasn't originally a HR, I remember seeing that. Cables are easily changed and are usually as a matter of course. Notice the ignition coils do not have the correct mount, so this bike has been worked on, not that it can't be set back in proper condition if desired. Anyhow, you have a good one to start with, you'll never win the 'most improved'. If you just want to flip it, you'll do good, but just remember, there's nothing like riding a Norton. Do what you have to, to convince the wife. I'm always leery of peoples claims of low mileage too. Only way to tell is inspect the crank and rods.
Dave
69S