I suspect that year home will be similar from the homes built a few years after your date. The cement block is covered with foam insulation, then furring strips on top of that, and then sheet rock, so there is a 3/4 gap between the insulation and the back of the drywall. You never said what you are trying to add, is it ac power or the coax cable. most of the cables are run from the attic down and not the easiest thing to do since the attic is filled with insulation, and get tight towards the end. I have pictures from when my house was built and the wire is in the wall the ac wire is not in pipe just secured to the wall so it stays out f the way and the other cables are done the same way. There is a 1x4 running across the top so you have to drill thru that then snake the wire down the gap in between. Just depends on where your getting the source from if from the side there is a few inch gaps from the bottom they install a 1x4 on the bottom and do not start the furring strip about 4 inches above that so there is a path across.
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