Help I have a question?>

[Tucknuts]

Maybe someone can give me a hand. O K so here is the issue, I have a 69 LWB that I converted to a SWB, The stock frame had leaf springs and I dont have a bed. The issue is that I bought a notch from SD but where the notch sits flat on the frame to rear end looks to far forward. I want to install the notched but im afraid that the rear end will hit the front of the notch when the rear end travels up ( and the rear tire not be centered ). This night be because im switching to a Ford 9" and it is set onto the leafs but something might be off. Can someone give me a measurement from the end of the frame ( tail area ) to the center line of the axle on both sides? this way it solves 2 issues the C-notch issue and the location to mount my four link. thanks in advance...