Well I wound up just draining and flushing the radiator a few times from the bottom hose as the drain plug is rusted shut. Filled it with water, ran the enginge, let it cool and drained again. I did this a few times with water then added 50/50 zerex G-05. I replaced the thermostat and found that one of the previous owners had placed a gutted thermostat in there, no valve, just a shell. I guess they were having overheating issues as well. He failed to mention it though. Thanks