Wow, nice car. All of the D.C. and Balto. area owners should have a GTG when the weather warms up.
Your engine mounts have collapsed. Check the space between the oil pan and the subframe. On the other hand the exhaust pipe sealing rings may be missing.
Also, get a grease gun and some good grease, like Mobil 1 synthetic, and grease all your suspension grease points. Every joint on the front suspension has one, there are two or three on the drive shaft and 4 on the rear axle. Two are on the swing axle joint and two are on the brake torque compensation bearings at the calipers. These are often forgotten and deteriorate.
If you cannot grease any, they must be cleaned out.
Check this Russian web site, On panel 2, the bearing is part 181, the zerk fitting is part 197.
Russian Web Site Info etc...
It've found the site to be a good resourse but I've found that the part numbers are different from the dealer. YMMV
Models W112, and W109 are very similar mechanically.
Also, check these guys for air suspension info:
Star Motors - Home
and the M100 group. the 6.3's etc have the same air suspension.
You're very lucky that the injection pump was replaced. The distributor has dual points.