It’s been awhile now but I believe my fenders were from Golden Star and they fit decently. I am running wheel well moldings so had to do mods in that area as well as the passenger side cowl mounting tab-my car was going to require 3/4” of shimming which I didn’t like so I had the body shop cut/lower the mounting hole. One other item to note is that the body lines on the aftermarket are not as crisp/narrow (they’re wider) as originals so since I had aftermarket quarters and fenders, my door center body line had to be built up to match. Yours will probably match since all your sheet metal is going to be aftermarket. Just an FYI based on a little experience over this last year.

You did not notice fenders were 100 pound each, that is usually the first sign.

I've been there with less than perfect used stuff.... How bad is it? ...Can I fix it?....YES YOU CAN!!.......Build yourself an anvil stand and make some buck pieces shaped from lumber to hammer against.....For filler, I like Evercoat brand "Lite-Weight".......Those internal door and window pieces are galvanized, so might want to go easy on blasting or use a gentle blasting media.....Watching your videos keeps me motivated to work on my 69 van each day, though it will be a piece of junk compared to your nova..... ROCK ON!!..... Hope to catch a ZUSA show soon on the other side of all these mask mandates...