1975 ford 3400 cab heat help

I installed a cab on my ford 3400 diesel and I need help with the plumbing for the heater core, I see a plug on the lower rad hose aluminum inlet but I don't see anything on the thermostat housing or water pump and not sure where to plumb it correctly, thanks
 
Do it just like the factory would do if it had a factory cab: Water return will be #9 at the link below, this is the water pump inlet. The hot water supply will be a port between the two rearmost intake manifold attaching bolts. If for some reason there is no plug there, remove the manifold and drill and tap your own 3/8" NPT port. This is very easy to do with an aluminum manifold.
Water return plug
 

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