When a DD is down it is a pain.
An oil pump is a simple object, something caused it to fail. I would pull the engine and see what is in the pan, sounds like the pickup screen is plugged. If your timing gears are teflon coated and the teflon has started to come off you will drop the pressure. When this happens the pressure tends to go away as the truck is running, do you have any pressure cold?
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Jon Hart http://www.coolharts.com
72 Chevelle Malibu / 69 Chevelle Malibu 4 Door
72 Chevelle Malibu Father/Son Project-- In Pieces
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