I'm a Fuel injection user. The only thing I don't like about the MSD unit is that the computer is mounted on top of the engine inside the throtttle body. I had to deal with a 1981 Chrysler Imperial, in which Chrysler put the computer and modules, including the fuel pump, inside the air cleaner housing. When the engine is shut off, all of the heat goes right to the top and the hood holds it in. I found that all of the potting material was melting out of the containers and turning into goo.
I still mount my computers inside the car with me. The MSD videos show a very simple setup with a few wires to hook up. I would love to try one if it was less than a grand. If you already run a fuel injection throttle body or multi-port manifold, you can get a FAST conversion kit for aroung $850. The same thing with a Holley Avenger setup is about $1450.