Wilwood conversion problem

Your original wheels are for drums?

The center register on those is smaller than the one's on the later disk wheels. It's a pretty common problem. The later 73+ disks had a HUGE hub, a lot of aftermarket wheels don't fit without machining.

I had to have the center bores on the rims on my Duster opened up to clear the hubs on my Dr. Diff 13" rotors, and those are smaller than the 73+ disks. The Wilwoods have an even smaller hub than that on most of their kits.

Since your rallye's are steel, there really isn't anything you can do to the rim. You could try using a spacer, but my guess is that you don't have a lot of room to the fender to work with if you have stock rallye's, so you may not be able to run a big enough spacer to clear the hub without having the tires hit the fenders.

More than likely you will need new rims. Aftermarket rallye's are out there to fit the stock disks, they should clear the wilwood hubs as well. Just make sure you figure out the centerbore of the rims before you order them.