YES YES YES YES YES
if you have a stock delco am/fm/tape which looks like this:
delco am/fm/tape on ebay pic is there
you can control a CD changer with that. I'm not sure if a 6 disc changer will work but a 12 disc will for sure as that's what I'm running in my car.
for a pic of the changer go this thread.
go to this thread, and then click on link either mouning spare tire or my 94 caprice pics
Sorry for not giving you exact link, I'm trying to open up the correct photo album but for some reason it's slow now.
Read this as well, this explains it all in great detail.
impalassforum tech tips installing CD changer
BTW I got my radio from ebay with buy now for 75$ and got the changer used from Impalaclub classifieds section
my changer looks like this here: 12 disc CD changer on ebay