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hi  I changed to a new alum dual core    79  350 ci   it udes to run 200 to 210,now rund at 180 all the time  no regrets   car is all stock not a show car   so I thought that it was better to have a car I can drive in the summer in conn,and I been in TEXAS  its hot going to Houston on sept 25th .dwa

This makes a lot of sense indeed. Thanks. I also noted that Dewitts' and BeCool's are 1"core while Champion has only 0.63" cores. 2 x 1" is more than 3 x 0.63".

The efficiency of (most)aftermarket radiators is a lot higher than the OE stuff from back in the day.That's why sometimes a smaller size radiator will cool just as well as the old timer did when new. Materials have also been improved. Be Cool, and Dewits are companies that specialize in engine cooling systems, not just the radiators, so they have a little more data to go on when designing a radiator. Off shore, or cheaper generic brands may look, and fit properly, but not work as efficiently as they should. The type of coolant used is also a consideration.
Regardless of the brand/style of raditater used, on a Shark era Corvette it's the raditater and shroud seals that play the most important role in cooling the engine. You can have the most expensive, best fitting/functioning rad out there, but it does no good if all of the available air is going around the rad, instead of thru it...
Be sure to replace, or re-install ALL of the seals around the rad, and the shroud to make the most of any new(or old) radiator.

I have the dewitts in my BB 68 & 383 73.  They offer a lifetime guarantee & stand behind it.  Go with a 25% antifreeze & 75% distilled water combo. Also put in 1 or 2 bottles of water wetter. You will be amazed at the difference. You also have a short water pump. My 68 runs 172 degrees all day with or without the air on in 90+ degree outside temps.

+1 on the Dewitt's radiator. Even though my '73 is a SB, I was very impressed with the fit and finish of the Dewitt's product. Fit perfectly and the Black Ice finish looks great !!!

Another DeWitt owner here.  I have the black coating as well.  I love it.  Used to over heat all the time here in Texas, now never.  If you have any questions about the DeWitt radiators, you can call the company and actually talk to Tom DeWitt!  Not sure you can talk to Joe BeCool. 

I think its U.S. Radiator that offers a 4 row Radiator for our C3's .   Id get that if I were you.   As an option, you may want to get a Stewart Stage 4 Water Pump.   That combo will certainly keep your motor cool and even if you elected to build it up .