Are you using stock '68 4 piston calipers or the single piston? If using single piston original or aftermarket, the stock wheels for '68 will not fit without mods.
I have a set of JC. They came from a drum brake car but are typically known as required for stock '68 with original disc brakes. They need restoration.
Vikki 1969 Goldenrod Yellow / black 400 convertible numbers matching