I discussed this car with Emmanuel, who suspects it's "as rotten as a pear" underneath. (He should know vis-a-vis his own experience). The jacking points are missing in the rocker panels. The bonnet doesn't fit very well (it's been modified, but that wouldn't account for it). Missing the front bumper, and the door gaps are uneven. Rear bumper is pieced together badly. It certainly is not a 1968 car - maybe 1970-71. Or 1972. Chassis number and interior makes this a later car.
Sunroof is a nice touch though.
This car needs a close inspection by someone with a good deal of familiarity with 428's, and a strong magnet.
Or very deep pockets.