Check out the link in my signature, I did a 3.8 to Cobra swap recently, but I had a donor Cobra to get parts from. Have you sourced out a 5.0 wiring harness and computer? The 3.8 one won't work. I believe you said you're gong the T5 route, so you'll need a new pedal assembly as well, to add the clutch pedal. All the pedals are in one unit, you can't just add the clutch pedal.
The front of the engine bay does not disassemble, the radiator support is welded in. But you should be able to pull the engine as-is if you get a couple of buddies to help. While you pull the engine back, your buddies can tilt the engine and tranny up so you get the clearance you need.