That's be the only one. I'm pretty sure they didn't have more fuse boxes until later years. What isn't working?
The brake lights were sticking on, so I replaced the switch. Then no brake lights. I had to repair the connections to the switch, but I have continuity. I looked at the fuse block and it seemed small for a car with power everything and I could not find any marked for many of the circuits I'm used to finding. I've only had the car a couple weeks. I have a shop manual on order, but for know I'm guessing.