Get the heads ported a little more, into the 260 cfm range or buy a set of aftermarket heads, either ported KREs or Edelbrocks.
Stick a Crower 60310 solid cam in it with a set of 1.65 rockers, a 3500 stall and hang on.
Also - what exhaust system behind the headers? 3" mandrel bent with good mufflers would be a very good idea.
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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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