[johnsjmc]

It,s likely legal if the person doing the repairs legally owned all the pieces. I have done a similar repair years ago to a vintage Mustang and an old 1964 Corvette.The Mustang was a convert and I used donor pieces from a scrap car to repair the front end. The Corvette crowd are so concerned about" numbers matching" .In the case of the vette I installed a rebuilt engine to replace the blown up original I had a block with the correct build date so I removed the vin number from my repl. block so it didn,t conflict with the vin on the rest of the car.. Likely your car has had a front clip welded on from another doner car either because of collision or rust damage. Prior to the galvanized bodies in 75/6 the early car front ends rusted easily. I scrapped a real 1967 S in 1974 because the front subframes were rusted out. Regret that to this day but the car was only worth about $2000 and parts were worth much more. As long as you aren,t dealing with an early S or MFI Carrera and aren,t trying to hide anything I wouldn,t lose much sleep over it. Today a carfax will find this easier than a vin check. Different states have different rules about clean titles. Your car is too old for a Carfax to find any accident records. And incidently I sold the Vette and about 3 owners and 10 yrs later I got a call from an owner researching his newly aquired "numbers matching" car. He had purchased from a well respected dealer with a so called documented appraisal. Someone had stamped the vin on the replacement engine. He didn,t want any more info when I told him he had been had.