Mid-America Motorworks sells a tool for this.
By pulling the hood release under the front of the car.
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There's a special tool that'll release the latch by sticking it in between the hood edge and windshield. Any Corvette shop or even a dealer should have this. I've seen it advertised in Vette parts catalogs.
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Ecklers has the replacement cable and "Installation instructions" which show how to get the hood open so you can relace the cable. Tried to attach the diagram, but no attachment tool here.
I have an 84 Vette and had a similar problem. Get a needle nose pliers. If you able, grab a hold of the cable which is just behind the hood release handle, grasp on to it firmly and pull it, but to to hard. Have someone help you to open the hood at the same time if you need to. ...................Matt B.
== == there is a tool i saw in a catalog trying to find which one. that tool was for 1984-1996.but they do have emergency hood release cable that can be installed in 68-82 part #604-801 for $19.99
pull hood open lever from inside of the car then slide your hand under hood to the left until you find the side ways lever and push on it to open hood.
driver side, left under the dash. Open the door and look on the side of the dash there should be a picture with an arrow
Mid-America Motorworks sells a tool for this.
There are hood tools. But if it is stuck, you might have to jack her up, remove the wheel, and back fender skirt. Then the fun begins. If it is broken at the hood connection, you will have to bend a metal rod to reach, and pull.