71 c-10 a/c wiring

[putnam00]

I'm converting my 71 c-10 from non a/c to a/c. I have already hung the heater/condenser box under the hood. i have a fuse box from a factory a/c truck and i hope all the wiring. do I need to change the fuse box and all the wiring or just add it to my current fuse box? and does anyone have a diagram for under the dash so i can hook it up and get the heater working until spring when I can get the a/c working