Correct Charley, the 15 inch rally wheels and F-60-15 tires on 1970 Hemi E-bodies required a clearanced fender, wheel lips rolled back etc. Assembly line folk probably put the wrong fenders on in Hamtramck (this car may have been part of the learning for that).
Hemis came standard with 15s. Six-Pack and others ordered with 15-inchers as an option got E-60s.
As to why it had to go to an offsite body shop...
dunno