Are you sure its a RA manifold & not std log manifold? A part # starting with a 4 implies '70 & later but not late '70's which start with a 5. Original Long branch manifolds would have started with a 97...
closest # is #478140 = '70 A -70 1/2 F RAIII LH manifold
(fit F & A-body chassis, but was redesigned from '69 style A-body RA3 manifold to clear Z-bar in 2nd Gen F-body chassis).
For reference, '67-69 F-body D-port longbranch manifolds
9779495 LH (same as 65-69 big car HO)
9779493 RH (has flapper)
9791607 RH (flapper? I believe so)
9797073 RH (no flapper)
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