The McLaren M6GT was tested back in the 12/74 issue of Road & Track. The engine wasn't the original stock Z28 engine but a mildly tuned 400 ci small block (the owner claimed 470hp but that seems optimistic). The 1/4 mile was firstname.lastname@example.org. The e.t. is not that great because of the straight cut racing gears, but that trap speed is in the Porsche 959 class. Unfortunately, no 0-60 time was reported. The skidpad figure is still outstanding compared to modern supercars - 1.12g! The braking figures also blow away many of today's cars - 60-0 in 110ft and 80-0 in 170ft.