Hey Als78, Welcome to the board. Have you check to see if you are getting any current out to the blower motor? Also, have you checked the low and medium settings on the switch instead of just high. The high speed relay was famous for going bad on GM's from that era.
If the fuse is good and you have current at the motor then I think it's safe to say the blower motor is bad. Make sure the little ground wire is hooked up also. Sometimes you can tap the blower motors metal housing using a plastic handle screwdriver or something similiar with the ignition switch on and the fan switch in say the medium setting. Sometimes the motors just stick from sitting. It will probably growl and grunt if it does start turning again and you'll probably wanna start looking for a replacement at the point.
Hope that helps and if not please start a new post so we can help you without mixing two problems in one post.
