I just checked out a Toyota Camray rad.
The toyota Camray is the best selling car in the U.S.
The four cylinder rad was 29 by 16 by only 1/2 inch thick! 
Looks like it is as large in area as can be and made only 
thick enough to do the job. This of course reduces the 
aerodynamic pressure drop through the rad.

The six cylinder version is one inch thick.

Unlike the rad in my Ford Cougar the tubes run up and down 
instead of left and right. The Toyota rad is done right! 

The advantages of this are two fold. 
One it reduces the water pressure losses through
the rad to reduce the HP required to circulate the coolant
and two the average temperature of the rad tubes is higher
so it is a more eff. heat exchanger.

Two of these rads could be sawn in two to make up
four sections. Two of these 16 by 15 sections could be 
arranged back to back and installed under the cowl
on each side of the engine in Jim Mosure configuration 
or all four could be mounted back to back in Neils 
arrangement. New header tanks would have to be made 
of course. 

Paul Lamar
 
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