It isn't pre computer, but it is pre-Onstar, and that's something...
I have a 37 year old van I keep in running condition, and still use as a backup commercial vehicle when the fancier stuff goes down. If it comes to bugout time, it's going with, simply because I can fix it.
Oh, mount them empty and bleed the system. You’ll likely be amazed at the crud that you get out of the lines—so keep bleeding until the fluid is clear.
That old GM stuff, I can get an alternator for it for like 50 bucks.
My Nissan will cost me a good 150-180 bucks for an alternator, and that’s still me doing the install!