thomas franklin

I have a 73 Z that had one of the headlights that would only light up dimly. The other is just fine. After checking the alternator and voltage regulator the check out ok. Recently it started blowing fuses when I turn on the headlights. I took the car to a auto electrical shop and they tell me that the fuse box for this car was inadequate from the factory and that they run "hot" and break down after 30 years. What I need to know is: 1 is there a aftermarket fusebox that can be used for this car? 2. Where can I find such a product to have installed? Any help would be great. Tom