From what I've seen of original wire tape it was the standard shiny stuff. the 3M expensive stuff it worth the money, goes on better and better.
much of your underhood stuff was bare metal , zinc , gold cad and it varied from year to year so you have to be specific.
the hood and latch , safety catch and trunk latch looked to be bare metal or a poor plating job on the original cars I've seen. I bead blasted mine then the heated them up and sprayed cosmoline on them, keeps them from rusting and gives an original look. maybe not concours but close enough for me.
On our AMX forum there was a permanent thread that was dedicated to original restoration detail , there are a few guys on here that could probably do one for E bodies, I'd love that. I just try to look at high dollar ebay cars and if enough of them have the same thing I figure that's correct. not an excact science but the best I can do.