You can lead a horse to water but you can't make 'em drink ...
1966 Shelby Cobra 427 S/C
With assistance from Ford and AC Cars, the team at Shelby American modified the existing AC chassis design to accommodate the big block engine. The completed design was called the mark III chassis was manufactured with larger and wider spaced chassis rails. Shelby ordered 100 of these from AC Cars.
Due to the weight of the engine the brakes and suspension were also upgraded. The body was featured prominent wheel arches to fit wider magnesium wheels and tires. Competition features included an oil cooler, side exhausts, large fuel filler, 42-gallon fuel tank, front jacking points and a roll bar.
Shelby Cobra 427 S/C
I think the earlier 289 FIAs also had sidepipes but I'm not sure.