Appropriate Wheel Offset for 18" Wheels?

First off, I'm running the Hotchkis TVS. The Hotchkis UCA's have a big curve in them (some other aftermarket tubular UCA's have them too) that cause interference way before full-lock, so the calipers have to be front mounted. Looking at it, there's no way anyone will be able to use any sway bar besides Hotchkis's as it's the only one that mounts inboard on the LCA. Also, an 18" wheel is practically required. I tried fitting a 17" Bullet Mustang wheel and it rubbed on the inner wheel. I'm not sure how the '73-76 cars are, but that's for the '66-72 cars. I hope that's of some help...
thanks MuuMuu, I saw your thread on the wheel buy and thought they looked good on your car. I was wondering if 18's were going to be a requirement for the big brakes, hoping to run 17x9's. did the 17's just rub? may be possible to clearance the caliper a bit if it's close. are you still on a pre 73' K-member?

thanks chuck