I went ahead and took out the alternator from my buddies 93 F150 project and put it in mine for a temporary solution. It seems to have solved the problem on the ride home (8 miles) and pulled a consistent 13.7v. Im going to order a 160a 3G (direct swap in late models) along with some Mil-spec terminals and the 2g recharge cable from Ryan's (Fireguy50) website. It should be good maintenance as well as a nice upgrade.
it's not an upgrade unless you do all cables related to the charge circuit. otherwise, IF you had a high draw situation (like a winch or something) just because you have a good 2 GA charge cable, the ground may not be adequate. So in addition to the above, you should also just go ahead and:
1) you need the buss fuse appropriate to the alternator capacity since you'll be doing away with the fusible link in the stock charge cable.
2) this means you actually need:
--cable from alternator to buss fuse
-- short cable from fuse to fender relay (this is the way I did it)
--short cable from fender relay to batt +
Then you need
--black neg. cable from batt neg to fender (recommended)
-- black neg. cable from batt neg to frame and block.
I added some of my pics, I think, to the 3g swap thread. Im not actually digging the mil-spec terminals, would be neater if I had used marine terminal with a little wingnut.