c notch already in, want to move trailing arm crossmember back

[jcblue]

im concerned.. i have already installed my c notch and welded it inside the frame rails.. my problem is after looking at other trucks i feel like teh rear end needs to be moved back some to the wheel will be centered in the wheel opening.. im pretty sure that after i move teh crossmember back the rear axle will not be centered in teh c notch.. I need any advive as to what i need to do.. thanks in advance