The OEM alternator should be about 95A, +/- five amps.
I've just worked out a kit using an ANL fuse to allow for upgradeability as an options for my "mains wiring" kits - you might want to check my website for some details. I've just finished Finals for this quarter, and I've got a whole swale of website updates to work on, but there's some basic information there, and I'd be happy to answer your questions. There's a link in my sig...
As far as upgrading on OEM wiring, I'd be disinclined to. ChryCo is notoriously cheap with wiring (they don't use anything they don't have to,) and if you end up needing full rated output from your upgrade, you'll probably melt the output lead.
5-90
