Oil Cooler Questions

[mike67cam]

I am getting ready to order all of the necessary parts to add an oil cooler and remote filter to my 67 Camaro but I have a few questions. First, what is the appropriate line size to use? Most adapters seem to come with a ½ pipe thread which has an i.d. equivalent to around –8, but Canton manufactures an adapter with –12 o-ring fittings. Is –12 too larger? Also, any recommendations on the size of the cooler? I was looking at using an Earl’s cooler.
The engine is a 509 big block with a Procharger that will be mostly street driven but I want the cooler for an occasional track day. I am going to run an oil thermostat with a 215 opening temperature.

Thanks!

Mike