I'm gonna say someone put that engine in that car for whatever reason. Dealer/mechanic yes, factory, prob not...
Once, I bought a car from a relative, a 71 Monte Carlo. Went to auto parts and bought all the standard tuneup parts. Points, plugs, cap, etc. Drive to work next day and started to run rough, barely made it home with one heck of a noise under hood. Two plugs blew out of heads, couple more were loose. Ends up that the plugs I put in were tapered style, but the old ones had washers. 71 first year for tapered plugs. Eventually found out my long block had been replaced for a mechanical issue. They thought the dealer just fixed the original engine when I talked to them. They weren't sure what was the problem originally, but dealer did fix it and it was fine afterwards.