In West TN outside of Memphis there would be no CCM radio if K-LOVE and WAY-FM hadn't come in because no Christian station in the area would do anything with it until they proved there was an audience for it. Because of that most people only know about the CCM from 2000 on like was mentioned by Crainebo.
A classic CCM station with anything from before 1990 is definitely out of the question in most places where CCM was never heard of before then or faced opposition from churches and radio stations that wouldn't give it a chance. EMF does still have some K-LOVE Classic stations, but even they're mostly AC CCM from the 90's.
The best options I've found for classic CCM have been online like
Classic Christian Rock Radio and Dan's station at wpjb.org, although he does a broader range of Christian music at times.