The screwdriver on the drill is the answer. I wouldn't run the engine again until you verify oil pressure. When you turn the pump, you will feel the resistance when it starts pumping. With the valve cover off, you will see oil coming out the rockers and the drain tube.
It is possible that the relief valve in the pump is stuck open, or that the relief valve spring has broken. Not common on a chevy, but I saw it many times on the perkins diesels.
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