[woodridge]

I did a quick search in the faqs section and didn't find anyting on factory ac.
The firewall will have to be modified as well as the dash for the center vent and side vents. If you are taking ac off another truck then do a tracing of the firewall and the center and end vents in the dash. If not,you will need someone to doa tracing and send it to you. Also,if your are needing to do a lot of rust repair on your cab you might consider just changing cabs.

Oh, yes, welcome to the board, sorry you got off to a bumpy start. You will find the members here very helpful. If you havent already, you might take a few minutes checking out the site rules. It can be very helpful in knowing how and where to post.
Keep the Q's coming, we'll do our best to help.