You're dead on, Jim!
I have a 400 with A/C and use the original 4 row radiator that was recored, all baffles in place, original fan blade and I run 180-190F all year long, even at 100F out there. What really helped mine years ago, I decided to replace my fan clutch with a HD for a bigger motor. You can hear the additional hissing sound, but it helped a ton keeping the car cool. Good luck, -pay attention to those details and providing your timing is good, you should be able to keep your car from overheating.