Definitely think you'll have a wait and see approach after you get your new gaskets. I spent a long time trying to get a 1407 ecarb to function well on my 455 and float changes were some of the most prominent changes to feel that I could make.
I don't know squat about the SD carbs, so I can't comment further than my experience there. Hopefully those changes help you out.
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-Jason
1969 Pontiac Firebird
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