Yeah, after looking at it more I think I still have the same questions. I'm trying to avoid spending 2 grand on a fuel injection kit when I can spend less on just swappin' an already fuel injected engine.
One thing I saw from most comments in the articles is that people are putting a carb back on the 4.0 head. If they put on a fuel injection system, it looks like they're buying an aftermarket package. Since this is what I'm trying to avoid, I'm thinking that using the fuel rail, computer, and other parts from the donor 4.0 will work just as well.
Maybe I'm better off swappin engines instead of just the heads... <img src="/forums/images/graemlins/confused.gif" alt="" />