How much cooling assistance from an oil cooler

I have a 69 Barracuda with a 340 pushing about 375 HP. It has always run a little warmer than I wanted. It has never overheated and spewed antifreeze, but I would like to see it run a little cooler. I've done everything that has ever been suggested in dozens of threads. I was wondering if adding an oil cooler would help cool the engine a little. It seems like cooling the oil would help. Any thoughts?