For comparison sake, I used to run a Fluidyne "single pass" oil cooler on my racecar. It had AN-12 fitting on each end of the cooler (and AN-12 hose everywhere elsewhere in the car) and it did OK in terms of temperature. Ran around 220°F on hottest days. The engine was a wimpy 3.2 short stroke (SC-based engine) with the original SC oil pump
It only had a bit of separation behind it to aid in air flow thru the cooler. My point of mentioning that is because I think it's noteworthy the cooler was a bit compromised by not having good separation behind it to help the air flow thru it, yet the car did OK in terms of operating temperature.
Walt is correct that the oil line routing was a bit more cumbersome.
The outlet side of the cooler had the hose turn 90° up over the top of it, back to the hose in the right front wheel arch so it could get back to the thermostat.
In one of the Grady threads I was searching yesterday, I recall him mentioning he believed the bypass in the t-stat opens at 100 psi. That sounds a bit low based on the stiffness of spring inside the t-stat. Coincidentally I bought some of these springs a few weeks ago. Reason I bought some of them is because one member here indicated the spring relaxes over time and lets some oil bypass instead of going forward to the oil cooler. So that undesired bypass makes the engine run hotter. I figured for $7 each, that spring is cheap & not hard to replace during the next t-stat rehab I do.