Long tubes are the way to go - you will gain approx 15 HP and ft/lbs of torque. The T/A works well, and with proper tuning, you can see up to 10 HP. The C&L system will work fine with your stock injectors and even upgraded injectors if you do that at a later time. Also, you may want to consider 4.10 gears as they are about optimal for the 4.6.
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