I have pictures of my lifted 78 f150 on here somewhere. By the way, I am rebuilding it. Have a crate of parts coming as we speak. I saw you over on FTE. My id there is stock78.
Now to the subject, I have a 3" body lift on my truck, and here's the key points I'll pass along.
1) Be careful using a cutting torch to remove old bed bolts. The rubber bushings can catch fire pretty easily, and are hard to put out when you are upside down laying in gravel with a lit cutting torch in one hand..
2) You are going to have to relocate your radiator. Remove the fan shroud in the mean time, since the radiator will go up, and the motor stays in the same position. I removed the radiator, measured and redrilled the mounting holes, and remounted the radiator. It works much better with the fan shroud.
3) Very important!! Unbolt the shifter lever if you have an automatic. I left my shifter connected and jacked up the body. I stretched something in the transmission, and cannot shift manually into 1st gear. You know how you have D 2 1. Well, I have no 1 anymore. The transmission goes to 1st automatically, but I can't manually shift it into 1st and have it stay there. Also, you will need to find a nice flat piece of metal to remake your shifter rod. I think my instructions had some bs about welding on a piece of metal that they included in the kit. It wasn't the same shape, and back then, I was just a dumbass teen. I found a piece of metal strapping that was thick and strong enough, and bent it and drilled it myself. Works to this day.
That's about enough for the body lift. Oh, if you have a regular ford rag joint for the steering, make sure you have a couple of spares handy. The angle of the steering shaft will increase making for more wear on the joint. I have a new Borgeson U-Joint shaft coming from Jeff's Bronco Graveyard.