Ditto comments on factory manifold with a properly prepped Q-jet. Q-jets require internal modifications to work well on big cube "built" engines though so you need to source on from someone who specializes in them (see the link to Cliff above, but there are others.)
'72 grilles will NOT fit the '73 nose. The '73 is a one-year-only design and the grilles are shallower than the '70 - '72 and won't interchange.
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'72 Formula 400 Lucerne Blue, Blue Deluxe interior - My first car!
'73 Firebird 350/4-speed Black on Black, mix & match.
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