In my opinion the original place it was sold is not important. The car has had a ton of work done to it since then. Is rear leaf really that bad? Have you driven a 4 link car? How aggressive are you planning to drive this car? All of these things should be considered. I think a 4 link is useless if you're not really going to put it to the test.
1969 x-77 Z/28 orange/ white stripes, named by my daughter "Clementine ", M-22 close ratio, 4:10 12 bolt, CE 302. Hugger orange with white stripes. White standard interior. Restoration complete May 2018