Nitrous is easier by far. Of course, it may fry your pistons, but brick engines are not expensive to replace.

I've never heard of an electric supercharger. Installation of any supercharger and getting it work involves dramatic changes to your intake system and fuel injection, and you have to know what you are doing. There were recently some pictures posted of a supercharged brick engine. I don't recall where I saw them, but it was probably here on the brickboard.

It would probably be simpler and easier to install a small block chevy engine as many others have done.

The easiest way to get a quick boost in power with no engine mods is to buy a can of model airplane fuel and pour it in the windshield washer reservoir. Then unplug the hoses from your windshield washers, cap one and and plug the other onto a centrally-located vacuum hose port. Find some open road, floor the gas, and hit the windshield washer button.

A friend did this to his Corvair back in 1968. It worked several times before the engine blew up. It was fun while it lasted.