Yep, most of my truck is now made up with rockauto parts, need more room on my steel closet because when I order some things they always send magnetic stickers/photos of finished projects "using Rockauto parts" I also found Partstrain very good but because I'm not living in the USA it's more of...
I vote for the pre 81, BTW my '78 D100 Custom is Venezuelan built, when I bought a US built '75 donor car the hood was too narrow, the tailgate didn't fit so there are even more differences