63 Lark -  Universal manufacturing - Part # CT6329A.  two row core with 
 1/2 " tubes @ .005 wall thickness.  This is .002 thicker than the tubes 
 on more modern day units.  It also has a higher cooling fin count per 
 inch for greater cooling efficiency.  This unit is guaranteed to cool 
 up to 400 cubic inches. Also specced for Hawks - Apr 2004 
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 Sep 2006
 Lark (Yr?) (6 cyl) A Nissan 280 or 300 Z radiator fits perfectly.
 (Barry/Houston)