Exactly Barry, I contemplated removing mine and then repacing it to give it the smooth look. But I did'nt contemplate to long, I decided to remove all the ridges in the original firewall then skinned over it with new metal. It turned out great. It also stiffened up the firewall so I could use a firewall mounted master cylinder.

http://www.imagestation.com/picture/sraid150/p0a7f2d0e2ed639c909beac7652844f60/f5daebaf.jpg