Rad and fan combo

I am sure this may have been covered, I admit I have not searched the whole thread, so many posts. I have a 68 cuda 340 s and I am in the process of putting in another 340 so I can rest my numbers motor. I am dead set on putting in a aluminum rad and electric fan. I love the look and I have one in my Mustang with a hot 351 and it works great. The 340 I am putting in is not stock and I want to avoid any cooling issues as the car will run a little too hot if you are going slow on a hot day right now. For those of you that have gone down this road, What are you using? what works the best in your experience etc.