For the most part, there is no custom fab work involved with installing coilovers. What is your goal with your lift? Looks? Off road performance and if so what kind?
The normal options are 1) spacers (the popular types include Cornfed and Daystar and these are available in 1 inch up to about 3 inches), 2) OME (Old Man Emu, its not an adjustable coilover, but a replacement for spring and shock), and 3) coilovers (Icon, Saw, Toytec are some examples of these).
I have Fox and those (along with King) are pretty much the top-of-the-line coilovers available for 4Runners, but they are definitely overkill for most and their remote reservoirs are unnecessary unless you do prolonged high speed runs. What your ultimate goal with the truck will really influence the type of lift that would be best.