Interior simply is poorly fitting garbage. You can tart 'em up with aftermarket leather, nice steering wheels/shifters etc. etc. but at the end of the day they still look cheap. Just new but cheap.
Chances are, whatever you buy will have to be de-boomered anyhow- remove the PO's "accessories" (Corvette logos on EVERYTHING). I had to on my C6- logos EVERYWHERE. It was dreadful.
Only thing tackier than a Vette fan is a Harley fan..