What's the fuss about?
My grandfather bought a brand new 1948 (IIRC) Pontiac. When it arrived, it had a Chevy engine. He was annoyed, but my dad and uncle told him the the Chevy was a better engine anyway.
My brand new 1980 C20 came with a GMC steering wheel. The dealer shrugged and said "Heck, that's nothing. I've seen Chevy trucks come in here with GMC tailgates."