Help,...Cop 4 Bbl Intake Part #'s

Found this page with a list of Mopar intake manifold casting numbers. It shows the one you mentioned in two places as a 1975-1976 and then again as a 1977.
http://bionicdodge.com/bionic/index.php?topic=5659.0

It shows:

CASTING YEAR & ENGINE MATERIAL
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2531915 1968-69 340 4bbl Cast Iron
3462845 1970 340 4bbl Cast Iron
3512100 1971-72 340 4bbl Cast Iron
3830945 1975-76 360/4 Bbl Cast Iron
3698484 1974 360/4 Bbl Cast Iron
3671918 1973 340/4 Bbl Cast Iron
3512100 1971-72 340/4 Bbl Cast Iron
3462458 1970 340/4 Bbl Cast Iron
2531915 1968-9 340/4 Bbl Cast Iron
3830945 1977 360/4 Bbl Cast Iron
3418682 1970 340/6 Bbl Aluminum
4095080 1978-80 360-318/4 Bbl Cast Iron
4100340 1978-80 360-1978-82 318/4 Bbl Cast Iron
4173915 1978-80 360-1978-83 318/4 Bbl Cast Iron