I wouldn’t use a caravan fan.
The Mark VIII and Tarus fans get the most publicity for being the “most powerful” electric fans, but for my 6.5L, I am using electric fans from a 1994-1997 Thunderbird/Cougar. The Thunderbird/Cougar just used one fan, I am going to cram two of those fans into my 6.5L radiator. From my research, they are extremely similar to the Mark VIII/Tarus fans but use different blade pitch and electric motors. The result is they move similar amounts of CFM but draw less current. The fans are two speed, so by using two of them I am creating a “three speed” fan controller by having (1) both in series on low (each fan sees 1/2 voltage so 6-7V), (2) both on low (parallel, full 12-14 volts), and (3) both on high (parallel, full 12-14 volts) using relays. I plan cut up and heat weld the fan shrouds to the old engine fan shroud to mount them. From my measurements they will fit, but they may overlap the edges of each other or the radiator a bit. (I just pulled them out of their boxes and started test fitting last week.)
This is very similar to the fan controller/mount I did on my Tacoma, except my Tacoma used two Camry fans and only had two speeds.
http://ecomodder.com/forum/showthrea...ler-32368.html