Love it!
I've always loved the SunTour stuff, and especially the Superbe bits. The pedals are some of the nicest of the era! Very handy to be able to swap cages and replace the cartridge bearings. I've got one or two sets in my stash.
I had a set of derailleurs identical to what you've got. The front derailleur is still in use and has seen about 50k miles. Even have a new front derailleur in the box... purchased 30 years ago because I thought I might need a spare. I shouldn't have been worried.

Looking forward to seeing how this story ends up!

Steve in Peoria