List for wiring modification

[gopokes]

I am getting ready to pull off my wiring harness to send it out to get modified. I wondered if you guys could help me out with a list of what all I need to tell them when I send it in. When I spoke to them on the phone, they said "give me the tire size, gear ratio and, just let me know what all mods you are doing to the truck". That was a little vague, and I would like to make sure I have all my ducks in a row before I send it out. I am going to use electric fans from a 99 Camaro, and fuel tank and pump out or a 99 Camaro as well.

Tire size
Gear ratio
Electric fans
Electric fuel pump

What else?

Thanks for the help!!