318 2bbl carb replacement

Pic , where is a good starting point ? All the way in and 2 Full turns out ? I see lost people giving lots of different numbers on this . Keep in mind this is ok my slant 6 now as no other options out there so I used the adapter and a 318 2bbl . Can't run a air filter until I make a housing that drops Filter down 2" but I'm working on it.

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