I played a little more today and I think I'm going to use the stock single core aluminum V6 Camaro radiator and dual fan setup. The core for that radiator is 17x25.

I had swapped in a 2 row cross flow brass/copper radiator a couple years ago to help with cooling while towing our 2,000lb pop up trailer, the core for that one is 18x18. So...

18x18 = 324sq/in - old 2row - brass/copper
17x25 = 425sq/in - new 1row - aluminum

Anybody have opinions on how well that will cool the V6 lugging around our aprox #4500 Amigo, plus a #2000 trailer up a grade?

And after searching Kragen's website, it seems the V8 and the V6 use identical radiators (as far as I can tell) with the exception that the V8 has a thicker core. I'll go ahead and mount this one, if we have cooling problems it's easy enough to swap it out down the road for the V8 variety which should certainally do the job. Odd thing is that they're both single row, the V8 must just use bigger tubes.