Hi Mike,
All of the above are great comments & one way to remember same, as mentioned above, is that "weight" is something to consider with all metal fabrication in lieu of just "cost":
As mentioned above, the Model A radiators that are designed to provide the coolant's full flow with enough tubes & also provided with enough cooling fins to resemble the originals, are the ones which will perform better for cooling.
One way to judge most metal fabrication is that all metals including copper, stainless steel, silver, gold & even steel beams are mostly always sold by "weight".
Hence, in fabricating anything with one particular metal, (sold by "weight"), cheaper metal products can be designed with this one particular metal & sold for less because of less with "weight" used with this one particular metal.
For example, even with dynamite type salesmanship, radiator manufacturers are fully aware that with less tubes, less fins, & less "weight", not only is there less "cost", but less "cooling".
After the sale does anyone think they care -- similar to manufacturers selling "sugar free" products loaded with "corn syrup" which is far more fattening than sugar for most individuals; but, it sells & about 90% of America never catches on -- & it is still "weight" related. LOL