I dont know a whole lot about the old gasser in question, but i do recall wrenching on a few.
Good motors really. They make good power, and are designed fairly tight. Unlike a older gm or ford inliner that likes running a little "loose", the Mb gasser needs a little more attention paid to keep everything in spec. Keep your valves and timing chain and the like tight, and the motor will live and perform decent for a good many miles.
