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Having some experience of those old engines I would have guessed 0.012" but the forum says 0.015" which in the old days was used on factory stage 1 tuned engines. Using 15 thou with a standard engine increased valve noise a bit but did give a slight increase in mid-range power.
It is wise to trim the feeler gauge to slightly less width than the valve stem diameter in case the rocker arm faces are worn.
Austin and related makes/models, unlike other brands, specified static valve clearance checking and adjustment though dynamic checking could be used if preferred.
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