4.6 swap

what will be required to swap from 3.8 to 4.6 from the motor mounts to exhaust. I've noticed that the fuel lines are on opposite sides as are the wiring harnesses. the a/c is different. can I get a fuel line setup and wiring harness set up off of a 94 cougar and have these things work? I'm hopingall I need is the motor mounts off of a 94 w/4.6 to get it in. I'm told the tranny from the 3.8 will work on the 4.6. Next I want to take the 3.8 from the cougar and put it in an 86 mustang. Thinking of making an "s/c mustang".