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The burly 9-inch rear axle stands ready for massive horsepower increases and will survive well above 400 hp despite standard 28-spline axleshafts. The dual exhaust was likely owner added since only the 351 Cobra Jet cars were factory equipped with duals in '73. Who cares? Let's stuff this one full of FRPP 5.0 DOHC Cammer crate engine power and a Tremec five-speed.