See page 80 and 81 of the ERA 427 manual for one way of doing it. Like everything else there are probably a dozen or so differnt ways that have already been done and several more in the planning/fabrication stage.
Ditto what Roscoe said. Don't forget the
oil thermostat. Most cars with the
oil cooler will not let the
oil get up to operating temps without the thermostat.
DonC