Preheat oven to 350°F. Grease a bundt pan well.
Whisk flour, baking powder, and salt. Set aside.
Beat butter and sugar until fluffy, about 3 minutes. Add eggs one at a time and vanilla.
Alternate adding flour mixture and milk with sour cream, starting and ending with flour. Fold in lemon zest.
Spoon one-third batter into pan. Dollop half the lemon curd, then half the blueberries. Repeat layers, finishing with batter.
Bake 45–55 minutes or until a skewer comes out clean. Cool 15 minutes, invert onto rack.
Dust with powdered sugar and serve slightly warm.