Last year I went to the Mustang Owners museum in North Carolina. All of the mustangs there are either the museum owners personal stock, or lent by mustang owners around the US. Stock changes every 6 months or so and they even have one of the oldest (by VIN that weren’t showcase preproduction) mustangs as a “barn find”. 
The people that run it are obviously knowledgeable and were a blast to talk to. When I went they mentioned that they were trying to acquire the full scale clay S550 model. It’s possible that it would have been the one that was used in the documentary “A Faster Horse”.
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Note the Bud Moore Engineering sticker on the second car’s door. It’s from the SCCA Trans-Am series; Moore also owned the #15 Ford in NASCAR’s Winston Cup series — a top team back in the day.
Thanks for pointing that out! That was quite a read!
You’re welcome; which article are you referring to?
And I was able to use the listed sources at the bottom for more info.
Forgot to mention, this one is a 1970. So it’s got a little more fat to it.
Fun fact, pre-malaise era cars were massively underrated on power. Some manufacturers (on these semi race spec cars) quoted half the power they actually made just so they’d be able to sell for stock car homologation.
Fun fact, pre-malaise era cars were massively underrated on power.
For some engines, yes (see: 426 Hemi, 428 Cobra Jet).
However, in the early 1970s, horsepower ratings were changed from gross to net, so most older engines were actually overrated (by about 10%).