I've got the same engine too. Always had the standard Niagara cooler mounted on the baffles behind the number 3 cylinder. No issues whatsoever. Rarely gets close to 200 degrees even in the height of summer. Dont over complicate things.
I do have the antisplat oil cooler door mounted in front on the cooler and it's fantastic. 180 degree oil all year long.
Port Perry, ON, Canada
7 Tip Up, Titan XIO-360, Dual P-Mags, Airflow Performance matched Injectors, Sensenich FP Prop, Dynon Skyview, GTR-200, GTX-327