Talk me into Fenderwell Headers

I've got mixed feelings about going with fenderwell headers. I'd like to hear from you all's about why I should go with them. My reservations lie with cutting the inner fenders and taking away from the front end stiffness, structure, etc. This car is to be street/strip driven with 75% street time. How do I handle running the exhaust under the car and out back since I'm using frame ties? Wouldn't this cause the pipes to be run lower to the ground than normal?

Background:
1968 Barracuda Notchback
BB Stroker Build in process
Low Deck
727 Auto
Front to Rear Frame Ties
Mini-Tub and Springs relocated