I run dual 14" fans and they suck! A 145 amp alternator too. The fans are just too small for my ZZ4 and A/C. I'm switching to a dual speed singe fan. Options include: Viper, Mark VIII, Taurus, or Jeep fans. An adjustable control with speed adjustments is ideal. The controler applies power per temperature readings. 50% power at low temps or near operating temps, full speed at high temps or preset.
http://www.fordmuscle.com/archives/2...cfan/index.php
I think mine would work if they had a shroud.