widest tire with spring relocation

-- If all you want to fit is 275/60s on your 67 Dart, you don't need to do the full 3" spring relocation. _ _ _ _ _ _ You should be able to fit that tire with just a 1/2" offset kit.
-- Yep ! That's what I did. -- BUT-- I thought that the kit was 3/4". - Probably not a big deal - Also, I had 15" X 8" Mopar Steel wheels, with altered back spacing. - Don't remember the BS.