Big enough radiator

My father's car has a combo like yours and he runs the HD three row radiator along with an edelbrock water pump, and an electric fan(not sure what brand/model though). We run a 160* t-stat in the car and the highest temperature I've ever seen it hit was around 180-190* when it was 95-100 degrees outside and we had the ac blasting. The temperatures I stated are from an aftermarket mechanical temperature gauge, the stock gauge in the cluster on his car was horriby inaccurate.
 
I'm using a 2 core HD rad in the 408 right now. With a 197F stat my temps have been dead consistent at about 205F.

My compression is less than 9:1 though. We'll see what happens when I rebuild to over 11:1. LOL

I say stick with what you have, until you have an issue.
This way you aren't spending money on things you don't really need.

My thoughts,
jason