You didn't tell us whether you're working with a Mk3 or Mk4. I've done engine side footbox mods to both although they are equipped with Windsors. Armed with a tape measure and these ideas maybe you can make similar changes for your 4.6 car.
Like many other Mk3 owners I performed the well documented dv/dt "Rod Mod" on the right side, reversing the vertical bend then triangulating it both directions to the lower front and rear corners.
The Mk4 panel is shaped differently so I took a different approach by cutting a triangle out of it and bening up "pyramid" to provide some extra room around the throttle pedal.
Before, with the flat panel:
Hope that helps,