I suggest you do a "search" on this site. As far as the parts, what is he changing? just the evaporator, r134 convertion, compressor, receiver/dryer, etc? If it is the evaporator only, it is tooooo much $$$ for the parts. Check with the parts shop for prices. It is labor intensive, since the whole dash has to come off...Whatever you do, make sure you get a copper coil evaporator.
Good luck!
J.H.
86 300E