[Jac Mac]

Try hooking a couple of portable w/shop extractor fans with ducting into the engine compartment while its idleing, if the additional removal of hot air from up high in the engine compartment is enough to stabilise the temp then you know its airflow. As I mentioned earlier you might need a couple of smaller fans mounted in the wheel/header bays to acheive this. The Daytonas & Flip Top have the ideal situation in this regard, virtually none of their rad heat goes thru engine bay.