I used a 1.5" bolt on spacer on my '66 after swapping to CPP disc brakes. Got them from Summit for a Toyota pickup, bolt pattern is the same and the hub opening is big enough to clear. The stock wheels were already painted so I wanted to keep them. I used 8" rear wheels so the 1.5" spacers up front pushed the wheels out to match the fitment of the wider rear wheels. Had them on the truck for around 1000 miles before I sold it with no problems. No shakes or vibrations up to 90 mph even though they weren't hubcentric. Circle track wheels are lugcentric... no problems from those guys either.
