So the CalTrac has a locating hole and post off the bottom of the spring - and with that bolted to the axle housing via the U-bolts -- the rear end won't move - so it's "okay" - as long as those bolts stay torqued.
My guess is -- when they were loose - it was allowing some (minor) movement which is probably why that lower "post/bolt" was a bit damaged.
There appears to be a spacer in between the spring and the axle perch... and you can see that it has a hole in it. That would have sat over the post if there was one on the top of the spring. Sometimes those spacers are tapered and are used to get the pinion angle correct. Yours appear to just be spacers to lower the car half an inch or so.
Put some RED Loctite on those U-bolts so those nuts won't come loose again.
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