Thank you for the input but I think the hole size and number should be plenty to let in enough cool fresh air. The cooler has 1.5" of clearance from the bottom of the trunk floor and each hole is 3" diameter making a total of 35 squares inches of area to let in cool air. The trunk already had plenty of areas letting in fresh air so I almost thought about trying it without any added holes, so I am fairly confident that the holes will be plenty enough. Regardless, if the size of the holes aren't enough once the hot months arrive I have the ability to add more holes but I would bet what I have will be plenty, however I have been wrong before.
I took the Puma for the first drive today. I needed fuel so I drove it to the gas station and back about a 5 mile round trip. The oil temp needle barely moved and the oil cooler bypass loop was only warm to the touch and this is without an oil cooler hooked up. It is 24 degrees out so that has something to do with it. The car really has power now, I didn't really get on it but it still felt much stronger than the pre-repair engine had on tap.