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The 77-82 hoods have a completely different latching system than the earlier C3s. All that is mounted on the hood is the catch, unlike earlier that have the latch and cables on the hood.
Also, from what I've heard, the full length hoods swapped onto earlier wiper door Vettes require some building up of the fenders near the windshield to match the contour of the hood.
Mike
Hinge points are the same. Latch points are not. Eckler's makes a 73-82 style hood which will fit the 68-72s. Requires removal of the wiper door and hardware and the cowl vent. You will also lose the chrome trim on the trailing edge of the wiper door which matches the two fender pieces.