Not Ranked
I thought the original 289's used 48's.
If so, then the 347 engine displaces 20% more volume, and is pulling through an opening that is 9% SMALLER than the 289's weber setup.
Some 427's use 48's, so they're probably the size you want (19% more area to draw through than the 44's), though racing 427's used 58's which have 74% larger openings than the 44's.
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