CDI-MSD explain please
 

I have an MSD brand ignition (made by Autotronics out of El Paso, TX http://www.msdignition.com) in my 79 SC. The coil wire came loose and toasted the wire and burned the connection area near the connection. I replaced the wire with a temporary part from Checker and was able to get back on the road.
Question: Is this a CDI unit similar to the early 911’s and is this a unique coil?
I want to replace the coil figuring that this episode wasn't good for it.

MSD Coil....
 

Go to the MSD website and see what they recommend for a coil to go with your particular MSD box. That way, you can't go wrong, plus the MSD coils are reasonably priced.

Good Luck!

Fred Cook
'80 911SC coupe (with MSD M6A ign. box and coil)

Not sure where your coil is located in a 79SC but Note the MSD "High Vibration" coil is the only one that they recommend can be mounted upside down.