Hi. Process of elimination is the only way your going to find out for sure what's going on. The first thing I'd do is pull the thermostat run without it for a coupla days and see what the temp does. Write stuff down so if you wind up having to check different things you'll be able to keep it all straight. If the temp is the same as before after pulling the thermostat you've either got a capacity problem or an airflow problem. One other thing that I've heard is if the timing is wrong or the carb is lean it can make the motor run hot. With the thermostat out you should be able to do 55 and the temp not go up to 200. Take all this with a grain of salt cause all I can tell ya are things I've tried. One last thing, your sure the fans are pulling air thru the rad? I'm guessing if the wires are reversed the fan runs the other way? Hope this helps.