Bill...you do have to drill and tap two holes outside of the water jacket. However, you use the adaptor plate as a template and if you can use a hand drill it isn't a bit dicey. You use a larger drill bit to make an initial indentation and then finish up with a 5/16. Tape on the drill bit sets your depth...you never go into the water jacket. I installed (2) 3/8" studs and used nuts on the outside. My a/c belt tensioning bracket pivots from this point.
I've got some pictures of the process in my "tips and Tricks" webshot album. Of course it is easier with the front sheet metal removed but the block drills like butter, taps easily and the end result of a cool running engine is worth the effort.
I also have a pic of the entire instruction sheets in the album. Click on "full size" in the upper right corner for complete instructions.
If you follow the instruction sheets to the letter you won't have any problems with the install and you can forget about fan clearance to the radiator and harmonic balancer issues and just enjoy driving your cool truck.
Dave
BTW...the instruction sheets are on page 12 of my "Shoebox album". SBT!
