I currently have a 1984 300. A black 300TD (wagon). I am pretty sure it is fuel injected. I’ll check.
Yep, sorry for you. Its Bosch fuel injection.
BTW, mine has 241,000 miles and it will start, run and drive like a new car.
I paid $100 for mine and drove it for 12 years. It was still running when I sold it.