Too rusty.

Maybe you could have them blasted and powdercoat them silver so they look more like an all aluminum wheel?

My brother picked up a set of four 15x8.5's in the GM car bolt pattern for $200.00. They are the early ones that are one piece aluminum. They show up on ebay occasionally if you keep an eye out.

I saw a set of larger ones (17"?) on a 70 Z-28 and they looked better than the 15" do. Normally I don't like the bigger diameter wheels, but those looked great.