[dsraven]

found it finally. a pic of the 58 frame uinder the 57 GMC which uses the 57 chev rad support. it shows where the longer chevy frame (58-9 version) will be cut off and drilled for the bumper mounts. also shows how much the rad support mounts needed to move forward if you look closely there you can see the 58-9 rad support holes ahead of the 57 gmc mounts.