Safe to tow to shop??

Can you send a picture?  Is the picture below the type of clip you are talking about?  Unless there is something else going on with the springs, you should be able to install these without removing the axle.  

According to this mfg., "This is the small metal clip that goes around the leaves of a leaf spring, usually about 1/4 of the way down the length of spring. They are intended to keep your leaves in-line and to keep them from spreading too far away from the main leaf in the event of a large bump in the road, dip or jump. They are a simple 2 piece design that can be installed in minutes."

Mark

I noticed that there is also a version that uses a bolt:

I'm not going to give you any advice about safety of towing with a clip missing, but it might be worth it for peace of mind to go ahead and replace the springs.  You have to replace them in pairs. Chances are you've lost some of your arch over the years.  Springs aren't that expensive... labor is the pricey part.

Here is my opinion, for what it is worth... (which is absolutely nothing, depending on who you ask...)

Legal or not, DON'T TOW IT ANYWHERE without the windows installed. The reason is not what you would think at first. The airflow and blowing stuff around is one thing. The LACK OF STRUCTURAL SUPPORT is quite another. Your wall framing can shift a great deal without the windows screwed in place and can make reinstalling them a really tough project. If the framing settles by a fraction of an inch, it can put your window frames out of square and becomes impossible to fit them back in without alteration.

From what I can make out of the photos above, the springs don't appear like an issue for towing. The clips help to keep the spring packs straight, and usually it takes some pretty sever torque to twist a pack. The Compact is light enough that it shouldn't be an issue. If you are willing to invest the monies, the replacement springs is a good idea, no matter what condition the old ones appear to be in...they are still old after all. Mounts, shackles, U-bolts, as well as the spring packs would allbe new, so little left to worry about for another 60 years or so...