66 Barracuda 4 speed crossmember and floor tunnel

Wow! Thanks for all the info guys! Very helpful. Is there a special crossmember for dual exhaust? I didn't know that made a difference so I didn't mention that I have duals on the car already. Brewer's sold my mechanic a crossmember that's supposed to fit. It hasn't arrived yet. I also got the fiberglass floor tunnel from Brewer. Any thoughts on the pros and cons of steel vs fiberglass?
thanks