Hi David,
If nothing else, the 113 is a solidly built car. I don't know how robust the distributor is - I've got about 120K on my car, and it was not an issue. I use the approach that if it is working well, don't replace it (they knew what they were doing, for the most part, and the car is very solidly built). The Pertronix is a fairly inexpensive upgrade - perhaps a good starting point in your situation....
Regards -- Roger