The way to turn the primary is to cruise at 55+mph for the test and you lean out the primary until it starts to lean surge then you go back up two Jet sizes. Typically the carb is fine with the secondary jetting it comes with out of the box, you're just tuning your transition with shooters or cams and power valve. So will the manual I usually go a couple inches below whatever my neutral idle vacuum is and I try to use just enough shooter and typically the red Cam. I get away with 31 Shooters but on my typical 750 Holley double pumper I used to run.. #28 shooters worked.
I'm currently running a speed demon 750 double pumper and it likes the 31s. It also wanted three Jets taken out of the primary down to 73. So I have it set up at 73/83 as opposed to 76/83.