Heat sink style trans coolers?

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SR77

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Heat Sink : 2 Pass 20" Heat Sink Transmission Cooler Kit
Or
https://derale.com/product-footer/fluid-coolers/transmission/frame-rail/13220-detail

I've been looking at these for awhile now, anyone have real life experience with either style?
Car is a 72 Demon with a 408, 727, 3.91 gear, mostly street driven/cruises, tracked maybe once a year, occasional excessive fun on the street......shhhhh. I have a traditional trans cooler now. The lines where ran kind of stupid by the previous owner.
Main goal is to clean up the radiator for better air flow and to add an auxiliary fan for hot days/cruises.
Not too much of a fan of the radiators with built in trans coolers. Would be mounting either style below the drives seat on the inside of the frame rail. The frame is tied so I have a mounting option.
 
I've got a slightly different version mounted on brackets between the bumper bottom and radiator support so it gets airflow from that opening. Summit Racing® Heat Sink Transmission Coolers SUM-331000 My Dart Sport has a small opening/window where the license plate goes, but it's a good spot can be done on a Demon too, which has a bigger opening for airflow. A location further back will be less efficient and have hot air from the engine & exhaust going by as well.
 
For a transmission cooler to be effective, it must be in a direct air flow. As Locomotion stated where you are contemplating placing the cooler, it will not only picking up hot air from the engine and exhaust, but airflow period will be restricted.
 
Translation: I screwed this up and have no hope and no skills to ever finish it. YOU buy it and screw around with it.
 
3500 from what the paper work says. All I have to go off is what the previous owner gave me, can't call him because he's no longer with us. The car is down now, working on the brake system so I can't street test.

I have a trans cooler now but the damn thing seems huge.
 
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