Radiator upgrade experiences?

IMHO.

the number of cores is important but the fins per inch is more important as that is where all of the heat transfer takes place.

Contact US radiator, they can get you setup if you decide to switch.

Keep in mind the 383 darts used a 2 core 22 inch radiator with no issues. It was the heavy duty cooling with larger onlets and outlets.

I think today people are so cobcerned that their engine run at 180 or 190 deg ALL THE TIME under ALL CONDITIONS. The engineers who made these cars put many hours of work and the test engineers put in many hours of testing to determin the needed cooling and the temp range the engine should opperate at.

As for personal experiance. I gad a 63 econoline van that i put a 289 in. Stock sized rad for A 170 I6 but 3 core. No overheating issues.