Finished installing insulation (both the OEM cardboard style and a heat/sound deadener). Then started with new American Auto Wire (AAW) wiring UPGRADE that included a little firewall modification for new current blade style fuze block.
Note that I installed a speaker that would work with STOCK style vent duct. I did this modification to the Classic Auto Air system I am installing.
I'm bouncing around a bit, but trying to work all this together as this ol'truck comes back together.