Will it pass emission requirements? You serious about EMP? Get a magneto ignition! Another serious note about EMP, is have a grounding clamp near where you park, and ground the truck frame to earth ground. Auto transmission probably needs a large transmission fluid cooler added in front of the A/C condenser coil. You are gonna probably want to drain all the fluids, and transmission pan included. Is there a date code on the coolant hoses? Don't buy it if he won't let you test drive it down the interstate! I have had a few C/K series Chevys...do you have another $1000 for stuff that probably needs doing? Brake hoses, spark plugs,coolant hoses,valve cover gaskets, etc. A/C is R12 type and very expensive to repair.

Sure you don't want a real CUCV? This one sounds better...

http://cosprings.craigslist.org/cto/3252902735.html

http://denver.craigslist.org/cto/3258189668.html