Are you sure that is a Pontiac manifold?
My sources show some additions to what ol' Pinion head found. The closest part numbers I find are as follows:
478141 1970 Ram Air IV left side Firebird and GTO
1971 455 HO left side
490142 1969, 1970 standard right side Firebird
490143 1969, 1970 standard left side Firebird
490802 1973, 1974 standard right side Firebird
490803 1973, 1974 standard left side Firebird
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