You can always give it a whirl for six months or so and you be the judge. The proof as they say is in the puddin, in your case in the engine.
The cost will not be that much more, in that time frame to find the answer yourself.
Bet I know what the answer will be.
1989 420SEL 105575 miles
1990 Chevrolet E-Cab C-1500
1989 Olds Toranado Trofeo'