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The 455 H.O. four-bolt main block wears code YB, and 7F6 round port heads with 2.11/1.77 swirl polished and tulipped valves. A tried-and-true 068 cam features 288/302 degrees duration and 0.414/0.413 lift with 1.50:1 rockers. Streamlined cast-iron exhaust manifolds (No. 478141 left and No. 9799721 right) usher away spent gasses. Note the heat shroud on the exhaust manifold and the tube to the air cleaner were removed by the owner back in the day.