I live in Houston where it's hot but at least it's humid.
My FE is 520 cu. in. and 744 HP and so far the Fluidyne with a custom shroud and large Spal fan keeps it right at temp. The Fluidyne seems to do the trick.
The FE will not mount up to the frame mounts that are in there now for the Cleveland. You'll need to cut them out and have FE specific frame mounts welded to the 4" tubes. Careful with the height of them - too low and your
oil pan will be too low to the ground, too high and you'll have carb to hood clearance issues. Either way if it's too high or low you may have pinion angle issues. You have to check these every which way to Tuesday before you weld the new ones in. Get this right the first time and everything else falls into place easily. Take your time, use jacks, wood blocks, whatever you need to do to use the actual engine in place to mock up the perfect position for the new frame mounts. Make sure the headers are on the engine and you watch carefully that the new mounts allow the headers to properly exit in a centered position in the header outlet holes in the body. LOTS of things need to be juggled, checked and double checked to get these mounts correctly located and at the correct height.