66 SS Radiator- HD or not?

I have a 4 core radiator - guy said it was original from 1966 SS car. It has 4 cores, its a downflow radiator with 2 cooler line openings at bottom, and B P embossed on upper tank and U C on lower tank. No tank tags visible. Water fill cap is offset on drivers side and indented into tank. Says Harrison on it too. What is this- HD radiator or standard radiator for SS car?

It keeps my 454 motor cool-180 all day, even in Central CA heat!