I got the springs back in using an internal spring compressor I borrowed from autozone. The brand is OEM and it consists of an aluminum block with 2 hooks to go over the coil. It comes with a forked plate to go through the coils, but the MB coils were too tight to allow it to fit properly (or be removed when compressed in the car).
So I came up with this configuration - I slid the rod of the spring compressor through the hole in the LCA and threaded it into the fork block. This compressed the spring against the LCA. Note the cable as extra saftey. Dono how effective this would be, but better than nothing. The cable is stronger than chain. Since the spring is compressed to the LCA the susspenssion assemble needs to be lifted into place and the cam bolts run through the LCA bushings. Lineing up the passenger's side was easy, the drivers side was pretty hard and took some pounding and wedging to get it in there.
After everything was hooked up I removed the spring compressor rod from the bottom, folded the hooks together and looped twine around them to pull it out of the top of the spring. Pulling it out w/ twine made it much easier.

This set up wasn't ideal, but much safer than simply compressing the LCA with a floor jack. It worked pretty well and I wouldn't have a problem doing it again.
I still would be very interested to know if there is another spring compressor that can be used with the W114/W115 chassis. Some people on other forums have said to used Klann type compressors, but I can't see how it would fit. I think they may have used the compressor on a later model and just assumed it would work. Any other opinions or ideas would probably help others with future projects.