Here's mine, 12cms cut from each side of the support panel and a couple of pieces of 25mm angle iron (yes, overkill) welded in place.
This sits an LC/LJ 6cyl radiator nicely with about 5-10mm clearance off the subframe at the bottom and sits a little proud of the bonnet latch panel at the top.
I do have a large thermo fan installed, but since fitting the correct temp sender I have never had to use it. The motor only ever overheated once on the way to Philip Island sitting waiting to fill up with petrol and the thermo will be removed soon as the thermostat for it constantly leaks.
The cooling system is water and rust inhibitor only, when researching coolants I found that coolant raises the boiling point of the water in the system but is less efficient at transferring heat.
The motor is best described at XU1 spec and I have a trans cooler now fitted in front of the radiator too. A city traffic drive last Friday in 30+ heat saw the temp peak at 210, but generally sits around 180 and goes lower on a cool night's drive.