The HP tuner is what I picked for mine. You can download the program for tuning for free and pick thru it. It's pretty powerful but still intuitive. That's what sold me on it.
Yes there's only a couple wires to hook up, and that's all the computer needs.
Don't forget you'll need a fuel pump setup of some flavor.
You should probably reconsider this plan. There's nothing for talking to those computers, they don't like change, and the EFI itself.... kinda sucks. The drawbacks of a carb, and EFI, with none of the benefits of either, all rolled into one.