Fantastic info and pics Jon, thanks so much!
Studying some of the other 67/68 cars, it seems there were numerous different approaches to solving tire clearance issues. The Dick Guldstrand '67 Camaro had/has quite prominent flares, which don't appear to have the standard Camaro trim indent around the outer lip. So I assume these were quite heavily modified, perhaps with new metal added?
Another approach was the Firebird Jerry Titus drove in the final race in 1968. It appears the fenders on this car simply had the outer 1 inch or so of metal removed from the top part of the lip. Was this just part of the hurried preparation that took place when converting the car from a Camaro to a Firebird, or were they like this when raced by Jon Ward?