Almost looks like another set of holes could be punched in the spring boxes.
Only reason I have got away with 29.5 for a long time is because my quarters are cut/no good anyway. Looking at replacing quite a bit of metal soon, and am planning to straighten 6-8 inches in the bottom front of the wheel opening, where they always have the issue.
Not everyone realizes there are pretty big differences between wheel openings of a 68-70 coronet/charger and a belvedere.