QUOTE(IronHillRestorations @ Aug 21 2020, 04:49 AM)

The engine for the Dr's car was de-tuned, and I want to say that he put quite a few KM's on it
It was, and he did.
The orange 914S didn't get a lot of use. Apparently more powerful but not so tractable or nice to drive on the street. The silver 914S with Weber carbs instead of race MFI ended up with a
lot more km on it, though it's hard to know what the split looked like between Ferry driving and Ferry riding in the passenger seat. I get the sense he did a fair bit of that. It's also said he was a really smooth driver and nice to be with as a passenger, where one family member said riding with Ferry's sister (who had a reputation for driving through the alps very quickly) was, ahem, "inconvenient."
I too think this pair of 914Ss are among the ultimate 914s, alongside the Le Mans winner, the Daytona winner, the IMSA winner(s), the Marathon cars, and maybe a handful of interesting privateer 914 race cars.