Fuse Block Question

If your gonna be doing all that I would just throw a whole new harness in. You can get Painless ones complete for about 400 on the high side or EZ Wiring for about half that. They are easy to install and their over the phone tech support is great.

I've installed 4 now with very few problems. You can use the opportunity to re-run the wires and hide them to give the engine bay a cleaner look. You can also relocate the fuse block to the glove box or even the trunk so you dont have to bend over backwards to change a fuse.
If you've never re-wired a complete car you're looking around week or so for completion