The week was long - illness and other failed cars needed time too.
Result: 50 BTDC and 65 ABDC (measured under not optimized conditions with 0,005 clearance) are probably an evidence of the late 403 camshaft (36/76) and not a 401 or early 403 camshaft (15/65). Together with the written note of a preowner I'm sure enough to go on with 0,005 inch valve clearance. I hope the 0,0025 I'd found didn't harm the camshaft.
Thanks Geoff for the advice.
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