Chassis Stiffening

autoxcuda, what have you done to your barracuda to stiffen it up?

What would benefit more lighten the car as much as possible or achieve as close to 50/50 weight distribution as possible?

Cause I could use fiberglass bumpers front and rear, hood and deck lid, etc. But would it be better to just use fiberglass components up front and keep steel in the back to try and get close to a 50/50 weight distribution?