I'm disagreeing with the Spoiler not being muscle.
ENGINES Unlike its Cyclone siblings, the Spoiler was delivered with the 429 Cobra Jet engine as standard equipment, boasting 11.3:1 compression, 2.24/1.72-inch intake/exhaust valves, two-bolt main bearing caps, and a spread-bore 700-cfm Rochester Quadrajet four-barrel carburetor. Benefiting from a functional Ram Air system also issued as standard equipment— the V-8 was advertised as making 370 horses and 450 lb-ft of torque.
Mercury's factory literature made clear that the Cobra Jet could be trumped by ordering a performance axle package, which yielded the 429 Super Cobra Jet, upgraded with forged aluminum pistons, a solid-lifter camshaft with more aggressive profile (versus a hydraulic cam fitted into the lesser 429s), a 780-cfm Holley 4150-series carburetor, four-bolt main bearing caps (on the second, third, and fourth mains), and an external engine oil cooler.