Yes I would consider an upgrade on your alternator, I put a unit from Tuff Stuff on my trucks to get the 140 amp capability and the 80 amp support at an idle, where most alternators only carry 35 amps at idle.
I am running a set of dual 11" electric fans from SPAL on my 84 truck and I am using a fan controller that lets me adjust the turn on and off points. A person can do it cheap, but it is your truck and you want it to work without a lot of down time, so spend the right dough the first time and don't worry about it later. I also had the same fans set on my 91 Silverado and it worked fine until I sold it. The SPAL fans come iwth their own shroud, so all you have to do is make the mounting brackets for hoding the shroud up to the radiator. I made mine from mill stock aluminum straps from the hardware store in my area. The electric fans took some drag off of the enigne and the upgrade in the alternaotr put a little back, but I realized a small mileage gain in the daily driving of the truck, with the fans. The enigne warmed up easier in the winter and the cooling worked even when the truck was sitting at a stop, where a mechanical fan would slow down due to the engine not turning as fast. YOu can buy the fans in Summit Racing under the Be Cool fan line. OR you can go to the junkyard and build what you want from a reclaimed fan setup.
http://www.centechwire.com/Fan-Controllers_c10.htm Check this site out for fan controllers.