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Actually, '74 trucks did NOT have the VIN on the frame, so the DMV goes by the cab VIN. You will need it in TWO places, however, for the inspection, so the doorjamb and glove box or the like should match.
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...but the '80 frame will still have the VIN on it. Also, more than just a VIN on the frame is used to determine what year it is. What he is doing is called a "Cab Change" and there are specific procedures to follow. Call you local CHP VIN Officer and find out how he wants you to do it, if you want to keep it legal!