“It’s especially amazing that a muscular muscle car would turn up in a lady’s garage in Bristol,” said a bemused onlooker. The ’68 Firebird, a 5.7-litre V8 with under 84,000 miles, is heading to auction with its one-owner story intact. Meanwhile, muscle car mania is revving up elsewhere: million-dollar beauties strut their stuff at car shows, Kumho V8s roar into the Muscle Car Masters, and a camouflaged 2017 Camaro ZL1 sneaks around in stealth mode. Who knew muscle could be so charmingly mysterious?