Help newbieDisk brake conversion directions

I am putting a Wilwood disk conversion kit on my 64 Barracuda. They said it would work with 14” rims but my old steel rims do not fit. The center bore is too small on them to fit over the hub and the rim offset lets the welded tab inside the rim hit the caliper; so now I have to get larger rims. You should check to see if you have the same problem with your setup. Good luck
What
Wilwood kit you using?