Check on the push rods first. I'm thinking that since you found the screw in the intake manifold, it didn't make it to the piston. Hopefuuly it didn't bend the intake valve too, but you would get a popping noise from the carb ( compression coming back out) if it was. Good Luck!! It's alway's a bummer to hear of other's troubles.
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69 GMC K10 ..some restoration required....still..
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