Hello Xavier,
Here is the
Oil Cooler Adapter for the Competition Model (“R”) GT350 it differs from the 289 Cobra version. The filter hangs straight down so whatever the angle (90 degree) really doesn’t have the opportunity to rotate. The center bolt does double duty as the inlet fitting bolting to the block. The rubber gasket from an
oil filter (Fram HP8 or HP1) goes in between the block the adapter. A standard filter spins on vertically or right side up.
These “Cobra“cast adapters can be had from Cobra Automotive. Kind’a pricy at $275.00ish with fittings,
oil line are extra.
Attached are a couple pics of my engine with the adapter.