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Right. As Tom indicates the 77 is all galvanized. You still want to coat the edges of the holes to protect the areas where you've exposed raw metal; try a search on POR-15. You may also want to make sure that if moisture does get in that it has a place to drain - look for a low spot in whatever channel is affected? If the holes are just for clearance and not through holes for passing hoses, etc., you may consider fabbing some sort of plug that is appropriately radiused to give the clearnce you need and then bond it in the hole.
Good luck. It sounds like quite a project; I'd love to see updates.
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1977 911S
1973 Alfa Romeo GT Veloce
1997 Lotus Turbo Esprit V8
2016 AMG C63S
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