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This is a 1969 Boss 429 - one of the rarest Mustangs, with only 859 made. Figure north of $500k to snag a nice one.
The cars were advertised at 375 bhp (380 PS; 280 kW) at 5200 rpm and 450 lb⋅ft (610 N⋅m) of torque at 3400 rpm. Reported as 0 to 60 in 5.4 seconds with a quarter-mile time of 13.5 seconds at 105 mph, it seems docile by today's standards. Having driven the 428 version, I can tell you it felt a lot faster than that.
With this massive engine shoehorned into the bay by local Detroit shop Kar Kraft, best to stay in a straight line. Even at that, the ligh rear end probably contributed to slower acceleration times. You could smoke the tires on upshifts therough third gear. Massive understeer and poor brakes mean don't try road racing.
All that said, it is a beautiful machine.