the secondary set screw . flip throttle body over look at secondary will be on same side as choke on throttle body depending on cam size and h.p. rating you should adjust 1 1/4 to 1 1/2 turns out from plates closed also if you changed over both shafts you need to make sure that one carb had bushing in throttle plate that other carb does as well holley was very inconsistent in mid 90s to about 2000.. goood luck iwould sa scrap it and buy new not reman holley's should be one owners or only little use to be worth calling your own
JUST TRYIN TO GO FAST !!!!!!!!!!!!!!!!!!!!!