Like 72blunblu, I run a Champion 3 row with the Ford Contour fan and a Dakota Digital controller. Engine is a built 340 pushing 425 HP in a 73 Sport. For clearance with the CVF Racing aluminum water pump pulley, I had to go to button top pulley screws. That gave me just enough clearance. No issues with interference or the engine cooling.
I have a similar setup ("no-name" 3 row, Contour fans and an Autocoolguy PWM controller), except I have a 451. It's tight but I trimmed the plastic on the fan a little. I can sit still in 93F weather and the engine won't get over 185F :)
