holley 4777-7

Hello

I've a holley carburator 4777-7. on the secondary corps I have no idle mixture screws
I look on several links on net and it's no really clear.

I watch this empty hole, and i do not see thread ?

Engine run correctly

My question is

for this carburetor how many idle mixture screews must be present 2 or 4 ?

perhaps the two configarations exist ?

merci for your help

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holley 4777-7