Even if non-adjustable, I'll bet those a-arm to frame bolts will have some slop. The rubber bushings being replaced may have taken on a set, the manufacturing tolerances of the replacement arms will never be completely consistent, resulting in dimensions being slightly off from the old ones. Any changes in effective control arm length will be amplified by potentially severe, tire-eating toe-in/toe-out angle changes, which is the main concern if you have decent tires that you care about making last. If you want to check just one thing, I'd check toe. If you don't care much about tire wear, of course, your call to forego the alignment.
I got a "lifetime" alignment for my p-car, because I expect to do a bit more suspension work going forward. I was shocked at how far off the alignment was even after trying to put things back together as they came off. Although, I suppose it's possible that YMMV. I seem to recall you've already done some suspension work, so you know the drill. Nice job tracking down the torn bushing, by the way! Good luck.
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