I need more timing adjustment

Hey folks,what am I missing here. 64 225/6. Carter 1 barrel with new kit,just about everything on her is either new or rebuilt. Changing over the electronic ignition this week. The bolt holding the dist down won't let me give her more timing. Am I missing a trick???? She wants more timing advance. The timing now is about 1/4" above the 0 TDC mark on the flywheel. Need some help from you gear heads and thank you Todd