[DanEC]

Greg - I think trying to compare spring rates from original cars to most reproduction cars is kind of an apples to oranges comparison. I'm not familiar with the NAF suspension but unless it is a virtual duplication of the original, there are probably some differences in the points of connection to the lower a-arms up front and the lower suspension arm in the rear. Plus there may be some difference in the overal arm lengths. And the cant or angle of the springs will cause them to have a different, effective vertical spring rate component.