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Whole nose/front clip or just the outer grill shell, inserts and head light buckets. No need to swap radiator core support, just drill new holes. Can go either year direction.
77 2 piece grill inserts and round headlight to a 79 one piece grill insert and square headlights is done all the time. Not so much 79 to 77, but has been done.
To get to the hard to reach upper corner grill shell bolt pop out the side marker and get in there with a extension and swivel joint.