The Quadrajet won’t be too much for it, it will only give the engine as much airflow as it asks for.
You might have a little more top end power but maybe so little that it won’t really be noticeable until you at least have a dual exhaust.
I really wouldn’t bother with the intake and carb upgrade until you do the cam, exhaust and gear swap.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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