First off, for power, you don't have a whole lot of bolt on options. There are some options though, IF you don't live in an emissions controlled area. Where abouts are you located?
If you want a little bit of juice and tunability, you'd probably have to get at least a Weber carb. And if you can find one, and beat me to it, a Hondo header. Pierce Manifolds makes the Weber conversion kit for your car, so should be no sweat there. Good luck on a header... I haven't ever seen one for sale that fits the 81.
There's plenty of people here though who can help out if you have any other questions. Welcome to the site and enjoy the stay!
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