After much indecision and discussions with much wiser builders, I decided to mount the oil cooler onto the engine mount and not on the rear left side baffle plate behind number 4 Cyl.
The main reason is to avoid cracks being generated in the baffle plates.
I plan to construct a duct / plenum to allow for a 5" flexible scat 20 aeroduct connection from the rear baffle plate to the cooler.
