Recommendation for Headers/Exhaust on 416

A 1-5/8 tube IMO, would be the best diameter for the street and lite strip.
You may even find it better at the strip. High torque to get going

Exhaust wise, a 2-1/2 on the street is also fine.
The problem with 3 inch exhaust and if it is coupled with larger diameter headers is low torque and high sound.

The tti headers seem to fit the best and offer a good balance and high clearance from the street. That is what I would do myself if the pockets were deep enuff.