Since no one replied i'll share the little bit I know. You should be able to repin the rangers wiring harness to fit up with the mustangs engine harness and pcm. Long as you have then entire engine harness from the mustang you should be okay. Is it an MAF wiring harness??
Also the T5 will fit, but the shifter well be much farther back than normal. The shifter should come through the trans hump somewhere between the driver and passengers seats, but it has been done before.
One of the main problems with the sway is fitment. You'll have to do a little work to the firewall, or go with a 2 inch body lift, which makes plenty of space for the motor to fit, except for the heater box. There are a couple of different motor mounts out there that positions the motor slightly different in the compartment.