For the last 40 years I've been completely wrong. I thought that the Mach 1 was the top of the range. If Wikipedia is to be believed, it was the middle of the range, between the GT & the Boss. D'oh! Whatever, I love it. I think it's the perfect muscle car shape. I prefer the Boss 302 http://www.madwhips.com/a-couple-of-beautiful-early-mustangs/ but I'd settle for this.