One of the things Pete promotes about his product is the fact you can do away with the TCI box.
If you are going with the stock ing. you may consider resoldering the connections in the box. High speed missing, failure to advance, hiccups, burps and backfires all have been attributed to the poor solder joints on the OEM box. Several very good threads on this but no one covers it all thread.
If the box was functioning then it probably still will. But the old solder joints are a known problem. Kinda like going ahead and replacing the glass tube fuses with blades. The old works, but how long?