Want to install new fuse panel??????

[Carbo]

After doing searches I came up with nothing so I'm looking for some help.
I'm going to be doing some interior work on my 69 camaro here the next few months and one of the things I want to do is upgrade the stock glass fuse panel to the blade fuses. I've got all of the accessory blades tapped into as well as most of the circuits so needless to say I have plenty of wires plugged into the fuse panel. I want that cleaned up and I figured the best way would be to add a new blade fuse panel. Can I just get away with adding the fuse panel like this one http://www.painlessperformance.com/w...rchField=30001 or this one
http://www.painlessperformance.com/w...rchField=30003 without changing the wiring or should you change the entire wiring harness in the compartent as well? If possible, I would like to change out the fuse block only without having to change all of the wiring.

I've read that painless can be anything but so if you know of a better route, maybe like AA, all I'm all ears.

Thanks in advance