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Unless someone has changed the carb ,the engine should have a Lsn needle ,however ,some of the older small block engines had only the HSN needle ,your engine should have the atleast 2 needles ,in which the Lsn is hidden in the throttle slide barrel housing! As far as break-in sets ,you will have...

Did you look inside the throttle housing ,where the throttle hooks up to ,that is where the Lsn is located at on a 3 needle carb.?

It is not a cure all ,but does help get you running an does help preserve the o-rings!...:thumbs-up:

That is the same issues that I have been having with all of my old engines ,carb needles leaking real bad ,I had used some sticky diff grease ,an rubbed it on the o-rings ,that cured the problem!..:cool: