I am just finishing an oil cooler install on my CAV, I used a Canton billet adaptor and Earls 10X12 cooler and Earls thermostat. I mounted it at the left rear, in front of the hinge point for the rear deck. If you e-mail me at
D.Briggs@cox.net I will send you some pics. I think it is necessary, on the street the oil temp is fine but when I had the car on the track oil temp went to almost 300 immediately.