Found them!! It took a lot of light and a big magnifying glass but I found the front one right behind the Allen head cross-member bolt. Once I knew what to look for I found the rear number on the end of the cross-member behind the tire. The powder coat had filled in the stamp almost completely on both numbers. I circled them with a silver Sharpie so, in case the DMV inspecter asks I can show him. Good thing I had the body off or I never would have found them.
Bill Stradtner, Portsmouth, VA
427 S/C #9442
427W Dart "Replica" Ford Engine