Dave's right
Some other Dave beat me to posting the whys and wherefores of rear wheel alignment. I was full time turning a wrench when those cars were new, and have done numerous 4 wheel alignments.
As S.O.D. mentioned the rear wheels will begin to toe out at speed--which gives you your neutral toe setting. Back then, foreign car makers were much more in tune with real world alignment specs. and tolerences. I would use OE numbers.
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