Who would you let rebuild your Holley carb?

What are the issues? Did you true up the surfaces on the main body to ensure proper gasket seal? Did you get a manifold vacuum reading at idle and in gear to help you select the proper power valve? The sight ports for float level are only approximate and often require a level higher than the bottom of the hole to get good transition. Lots of things to play with like pump cams, arm settings and squirter nozzels too. To get initial set up down always turn the choke stat to full open then once the engine and choke stat are warmed up and you have set idle mixture and base idle turn the choke stat so you know where the end of travel is. In other words turn it back to where the choke plate starts to move and back it up just enough so that it is open fully. Mark that as a reference and you will know what position you should never go past. Also check the footprint of the base gasket. There are a few different designs and some will cause a vacuum leak on different brand carbs. Whenever possible always use the thicker insulator type base gasket and never over torque the bolts or you will break an ear on Holleys.