... .personally I would definitely decide on the firewall. Most folks, at least me, paints the firewall and takes a look for color clarity ect. It is also a good place to look at it and you can't see where other painted pieces join to it.
I painted the bottom of my firewall black... then the top was body color. If you would like to see what the bottom looks like painted then click on the photobucket below. Good luck. Keep us posted.
