CPTOBVI

-create louvers
-making more holes in the front is not effective and creates lift (which is why louvers are needed)
-move radiator to the rear
-relocate fuse boxes and all plastic covered computer / electronic parts for more room in the engine bay - make walls (compartments) in the engine bay to direct the heat out to the louvers efficiently.
-wrap exhaust manifolds, intake manifolds, etc.
-front v mount and radiator shroud is a choice
-more suitable viscosity fluid for your motor and trans
-keep the heater running constantly as it uses heat from your radiator

if you want to use a fan or make louvers, try making walls (paths) for the heat to travel through before pulling out through the louvers. a fan spinning freely without walls to channel the air is ineffective.

also depends if you are building a race car or a street car.. it's all about channeling the heat.