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I believe that head shown in the OP is a 3.0 Turbo head. The marking on the top left is the casting part number. This number is unique to the casting but it is not the part number. The part number and application of the part are determined by the subsequent machining process. The part number does not appear on the head. The marking on the upper left is the alloy used in the casting process. The RR 350 was used only on the 3.0 and 3.3 Turbo heads.
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Tom Butler
1973 RSR Clone
1970 911E - Sold but Never Forgotten
914-6 GT Clone
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