Yes. The car was restored by cc in 1984. That makes it 15yrs old at the time. The Mecum sale I linked from 2022 lists the VIN and the description also says matching numbers engine.
If the car has it's original engine, the likelihood that during the original restoration someone removed the bracket, even if that area of the pan needed replacing, and did not reuse it when putting the original engine back in is highly suspect.
Further to looking for other items that are unique to 340 cars, with the exception of bolt ons like springs, brakes/rear, dash and fendertag there are only a couple of things. Body numbers, right exhaust bracket, and possibly torque boxes (and being a small block automatic, these were normally not installed). I don't believe a coin was on the k member until 1970, but I stand to be corrected if so.