Lonzo,
I wonder if the 'high' corner damper is faulty, or in some way mismatched and is holding the suspension up ? Perhaps you should take both front spring/damper units off and compare them. Important: Do not muddle them up. First compare the complete assemblies, then demount the springs and compare the damper stroke from full extension to full compression. Check the part numbers match. Compare the springs for damage, height, turns and wire diameter. Compare the spring perches. If you find the answer that's fine, if not reinstall everything back on the car, but reversing the original position side to side. Now see which corner is high. If it is now the other side the fault is with that spring, or damper. If the high corner remains on the original side it may be a rear spring or damper which is hiding the problem. Possibly, although less likely, is there incorrect assembly or damage on the chassis or suspension ?
As you say all four corners are now higher I would suspect that the dampers have longer lengths of 'buffer' rubbers at the end of the compression stroke. If you have the old dampers that would be another useful comparison, you can see the buffers at the top of the damper on the piston rod. Have you asked Spax for details of what they have sent you, it might be that they have got it wrong, do you know how those part numbers were generated ? They are not the numbers they list for a Cobra, possibly they are a custom specification to suit the coil spring chassis ?
Last unlikely possibilities: have you got three rear dampers and one front or three fronts and one rear, or a front and a rear on each axle ? Clutching at straws here.....
Barrie