I agree that TBI is almost bullet proof. I love the Quadrajet but wouldn't swap from TBI on a daily driver. Easy to work on and pretty much trouble free, as long as you stick with GM factory parts. I've probably worked on thousands of these and absolutely love'em.
I've seen in this thread and others where it is recommended to carry an extra ignition module. Don't know where this comes from unless they're using aftermarket modules. I doubt I've replaced a half dozen factory modules in all my years, but I have replaced a number of aftermarket modules.
I'd have to say that the 2 most common parts failures on these (that can leave you stranded) are the fuel pump and the ignition coil (yep, I carry an extra coil (nope, not an extra fuel pump)). But, that said, I don't think either has a failure rate that scares me.
Don't know how bad your wiring looks, but it's probably worth fixing.