Stereo in 70 XR7 Convertable

Good morning and happy Thanks Giving weekend Canada. Not into stereo yet, but did manage to troubleshoot heating problem in car with the help of the forum. I sent a link from the forum ( Using electric cooling fan is better way? ) about heating issues to my pal at the auto shop, rebuilt / replaced 2 core rad with 3 core rad with a different thermostat, fixed the problem. Thanks forum!!! The shop spent a lot of time messing with it and were about to go down the road of electric fan, crazy unicorn thermostat for the cleavland.