I looked at raising the entire inner fender when I did mine. For the amount of work it would have involved, and the way it would have looked, I decided to only do the inner fenders in the firewall. If you did the entire inner fender there would be a large gap at the bottom. You could fill it in or section it to make the side taller??? For the amount that I would have had to raise them, it wasn't worth it.
Here is what mine ended up looking like...
Good luck if you do, do it, I am very interested in seeing it.