Have Multiple Noob Questions About my 2000 Acura ITR.

1. If i Change my Final drive to a 4.9 FD should i change cam gears / shafts as well? Any Information would be extremely helpful

2. Wanted to add some Forced Induction and have heard multiple arguments between JRSC and a Turbo. So i'm leaning toward a turbo. Any suggestions?

3. What else can i do to add torque? Still learning about the car, So Any information would be helpful .