Alan -
During the mid-1969 model year, the partial VIN for V8 engines was stamped near the oil filter, due to the '69 model year change in location of the alternator to the passenger side (covering the engine stamp pad). The block in this area is raw unmachined casting which makes this stamp difficult to see, especially with the engine in the car. The Norwood plant moved the partial VIN to the oil filter area in the December '68 timeframe, so this is where your partial VIN should be.
Paul