That looks like a Melling duplicate of the Pontiac 9785744 (Ram Air III) cam. Anyone could buy one back in the day and H-O Racing sold them as "Exact Duplicates of Pontiac Ram Air Series", H-O #HC-56.
H-O also sold a High Lift version with same advertised duration, but lift of 0.465 (I) & 0.469 (E) with 1.5:1 rockers made by Crane Cams under private label. It was H-O #HC-02 and was very popular, IIRC.
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Craig Hendrickson, the "H" in H-O Racing Specialties.
http://www.OriginalHO.com
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