I've got a 350 hp 351-W in my 65 Fastback, running an 8 quart Canton Road race pan (I use to open track the car a little).....
Normal street driving including sustained interstate speeds of 75 or so mph, my
oil NEVER gets above 185 degrees, I have no
oil cooler on the car......while open tracking the car with sustained rpms from 3500 to 6000, the
oil temp would get up to around 240 max, 90% of the time is was in the 220 degrees range........on the cool down lap my oil temp would drop around 20 degrees...
As Rob said,for street use, you do not need an oil cooler and you can get by without one for the occasional track days.......for the track I would go with a good
synthetic oil also..........
David