I did this swap a few years ago as a supporting mod for my amp-hungry aftermarket cooling fans. It actually turned out that a stock 140 amp CS144 wasn't enough for me and I had to upgrade the stator, bridge rectifier, and eventually add an overdrive pulley. However I finally got the amperage I needed at idle. I did a writeup on clubgp at the time (here) but the information in the OP gives you what you need. I did my writeup from the perspective of someone who has a '97-'98 bracket already installed (like myself with a '98 GTP). The information about the '99 Camaro bracket is good to know.

If you have the newer alternator bracket, I think you have a few other options for adding a higher amp alternator other than swapping brackets (although it obviously isn't all that difficult to change). If you don't need a whole lot of extra amps, I mentioned in my old post that a 2005 Buick LeSabre (it was used on a few other models around 2004-2005 IIRC) came with a 140 amp alternator that bolts right on to the '99+ alternator bracket. In my post though, I incorrectly identified it as an AD244 alternator. I believe it actually is a Denso hairpin alternator. IIRC, the hairpin alternators use more advanced technology and I believe they will give you the most idle amperage (i.e., Hairpin 140 amp idle amperage > CS144 140 amp idle amperage). However the real-world difference may be negligible and once upgraded, the CS144 should be better than a stock hairpin. I was researching all of this a few years ago, so I don't know if I am remembering it correctly. The disadvantage with the hairpin alternators is that I did not find any easy source for parts to upgrade the output.

I think there is also the option to use CS144 and AD244 alternators with the '99+ alternator bracket if you use this bracket adapter here. Kind of pricey for what it is. It would be nice if they had some pictures showing what alternators/brackets the adapter was meant for, but I guess you could always email them if you had questions. As I recall, the AD244 is similar to the CS144, but it is newer and has an internal cooling fan.

Anyway, it is a great upgrade if you have installed anything that is going to put extra load on your electrical system. As the OP noted, it is really pretty easy to open up the CS144 and do repairs or upgrades since all of the parts bolt in essentially. I recently installed a new head unit that displays the voltage and I enjoy looking at it when I'm at idle with my fans on high and see it still pumping out solid, steady voltage.