I replaced my dinky 63 amp alternator with a CS-130 (105 amp internally regulated) model. Did a "modified" one-wire approach. Cleaned up the firewall and the wiring a bit, too. Cost about $125 all told and only took me an afternoon for the most part. I'll bet it wouldn't take even a novice more than a weekend. I wrote it up for the South Texas Oldsmobile Club newsletter last year. I knew it'd get published 'cause I'm the editor.
Anyway, it's a fairly long article but I'd be more than happy to share it if anyone's interested.
C.J.