I use to own a hilux with a 253 in it and use to battle the temps often.i put 2 of these in with the scoop(caravan vents) bits facing backwards(1 each left and right of the bonnet) so the air could exit the engine bay..worked well..kept temps down to about quarter on the guage.
http://www.ebay.com.au/itm/CAMEC-016...3D231435835615