1998 Ford 7.0L (429) Gasoline Engine

I have a 1998 Ford Medium Heavy F700 with the 7.0L (429) gasoline engine in it. I am looking for any information that you all may be able to provide me with regarding products to boost WHP and Torque. I am currently using it as a service truck and I'm hauling almost 12 tons of tools in it. Needless to say, it's a bit of a dog. Also, I've been looking for the OBD-II port and am unable to locate it and would also like to get ahold of the Ford shop manuals for this truck. Thank you all for your time and assistance.