Quote from "FORD PERFORMANCE" by Pat Ganahl To install a post '63 cam in an early engine, remove the two small cup plugs on either side of the front cam bearing, thread the holes with a 7/16-NC tap, and use: Thrust plate (C3AZ-6269-A) 2 X #4 Phillips 7/16 UNC screws Spacer (C8AZ-6265-A) Crank sprocket gear (C4AZ-6306-A) Narrower cam sprocket gear (C3AZ-6265-A) Timing chain (B8A-6268-A) Timing gear key (7357-S)