whoa.. I got lost in your question there..
The motors you're trying to swap are already fuel injected if that's what you're trying to say here, you swap the motor and you're basically swapping the whole system with it. What you will need to upgrade is probably your fuel pump to that of a fuel injected car, maybe even your fuel lines. As long as you get the whole motor, harness and ECU.
A swap like this could go from $2500-4000 depending on whether someone does the work for you or not, motor alone will cost you a good $1000-2000.