Transmission Cooler Advice
I just finished installing mine.
I've got a B&M "stacked plate" unit. I mounted it in front of the radiator, and don't run through the factory cooler. I ran hard line from the trans to the front of the engine, and then rubber braided hose from the auto parts store to the cooler. I didn't want to use a hole saw on my car, so I ran the hoses around the driver's side.
I used galvanized pre punched 1" strips to mount it and didn't even have to drill holes in the car, as I was able to use existing holes.
It is WAY worth it to get aluminum line for the hard line portion. You can bend it by hand, it flares easier and cuts easier too.
I'd love to hear the 318 combination you have.
Good Luck
Steve