I have an 88 jeep wrangler that I put a chevy 350 in. It was overheating so I installed an aluminum 4 core radiator. It was still overheating. I put a 140 degree thermostat in. Still overheating. I put a 16 in electric fan in front of the radiator with the stock fan behind it. If it's above 70 degrees or so, it will run 210-230 degrees. Too hot for my liking. What's next? HELP!