Ok i lied... 7 Q's

The list kept getting longer. Thanks in advance for any help.
1. Which brand drag radials hook better? (I have 17 X 9 rims)
2. Do I need to upgrade my TB to 70mm? (don't wanna loose pwr)
3. What size Mass Air? (have stock MAF/Sensor on cold air)
4 Do the rear springs from a 94 Cobra fit a 94 GT?
5. Do high flow cats make an off road exause noticably quiter if at all, and do they slow ET's?
6. What size Cam and Rockers recommended?
7. Would I Need to upgrade stock injectors?
It's a daily driven car.