Don't know if this will help or not. Here are 3 photos, two of my 40 super, and one of 39, 12. As I remember there were already holes drilled in firewall when I got these vehicles. Mid eighties. The 39 interior is original, and did not have a heater when I got the vehilcle, had to cut holes in inside of vehicle fabric, etc., as I remember. You will notice extra holes in the 39 firewall, someone had mounted an oil filter, instead of replacing the original one. On the 40 you will notice a ball valve with a handle. When I attached the heater I had just had the interior done, and wanted to make sure I could completely turn the water off to help stop any heater radiator leaks, so valve on block and inline hose.
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