Why not find a 1970 Pontiac 400 carb in rebuildable condition and calibrate it to your current RAIV engine? There are services that will do that for you if you're not interested in doing it yourself.
I have a 1974 400-455 carb that was set up that way for my 1968 engine and it works flawlessly.
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Greg Reid
Palmetto, Georgia
 
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