Your Z's stance looks fairly similar to this pic of my X77 around 1976. Stock springs, stock YH rallys with F70-15 Goodyears front, H60-15 rears. The only non-stock items on the suspension at this point were the Mr. Gasket traction bars (which did nothing to alter the ride height).
Your X33 is a great find, beautiful car. Enjoy the daylights out of it !
Trying to reduce the image somewhat - first try too large.
Regards,
Steve