Here's your answer.
http://www.speedcooling.com/1967_197..._Radiator.html
I've running this radiator in my 72
for the past 3 summers in Hot West Texas with A/C for over 11,000k miles with no issues. I'm not running their fan set up but at $449 for a complete set up, not bad.
Also, a good 2core radiator will cool better. It's counter intuitive. More rows is not better.
Light reading:
http://www.pirate4x4.com/forum/gener...rass-tech.html