Add eggs one at a time, beating 1 minutes after each addition
Add flour and buttermilk alternately, beginning and ending with flour
Add vanilla, lemon zest and lemon juice. Mix to combine
Pour 1/2 batter into tube pan.
Add 2 tablespoons flour to blueberries to coat.
Add blueberries to remaining 1/2 of batter
Pour on top of plain batter in tube pan
Bake at 350 degrees for 90 minutes, test with a long, thin skewer. Cook another 5 to 10 minutes or more until cake is cooked. When tested with a long skewer no crumbs or dry crumbs will cling to skewer.
Cool on wire rack 30 minutes before inverting onto a serving tray.