Finally after over a year, I decided to get my heater install started. I worked on getting the heater itself mounted and plumbed today. Here's what has been done so far:

First I started with an M151 heater unit. Just the box and blower:





Next I decided that putting it under the hood was the best place. I didn't want to clutter the floor, and run coolant hoses inside. I also didn't want it on the firewall, so I did my install ala Deuce with it mounted on the fender and then ducted into the passenger compartment. I chose the location for the stock battery on the civvy trucks:



Next I plumbed the coolant hoses into the core:



The last item is a heater plenum from a 70 Chevy pickup. This will be mounted in the cab and with a duct from the heater unit will provide either floor or defrost. Very simple, yet clean:



Next week or so I plan on finishing the install, and I will post up more pics then of the finished product and let you all know how it works out.