Will you get enough cooling from the front cooler alone? BTW, that part looks amazing so I hope it does work well.
I'm doing the same thing on my 3.2 conversion. Cooling should be more than adequate. Air is outside temp, not engine compartment temp. Oil cooler is directly facing oncoming air, not relying on engine produced airflow. Cooler can be larger than engine cooler and a fan can be added to supplement airflow at low car speeds. You also get about 15% more air directed at the heads for additional cooling since the engine cooler duct is blocked off.
Porsche dropped the engine cooler and went solely to front cooling on their 3.6 engine before going watercooled. Why spend money on a front oil cooler just to use it as an axillary system when it can easily be the sole oil cooling system for the car. It also increases reliability by not using a 30-50 year old engine cooler.
I love the way Ben's mod makes it fit the stock oil lines. - smart!