Can anyone tell me whether there's a drain plug on the passenger side of the motor? I have found the one on the driver side but is out of the way for what i want to do. I have an espar coolant heater plumbed in to my heater lines right now but it is not doing what i intended it to heat the block, it is bypassing it somehow and making a loop around it. Sometimes it gets heat but most of the time not.

The existing heater goes into the hole on the passenger side. I don't think there is another one on that side. Why wouldn't you remove the existing one or use it for that matter. Your new one is plumbed into the lines going to the heater core? That is not going to work to well as the flow isn't there to circulate it around the block. In fact w/o the thermostats open and the pump running there is no flow at all. As you have found out your probably wasting your time on that one.

Did some searching on google. Is it true theres a drain plug behind the starter? If so can anyone tell me what kind of thread it is so i can tap my heater into it like you do on the old 350s for a circulating block heater?