Oh... something else you might look into is a set of early Vega (71-74) lower control arms. The spring pocket is shallower than what you have. I found out the hard way when I crammed a set of V-8 Monza springs in my '74 Vega. That might get you where you want to be without changing springs. I can do a little digging in my stash to see if I have any early arms if you want.
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