rear leaf spring questions

[canso]

I installed the leaf springs on a 72 chev 1/2 ton. The spacing in the wheel well does not seem right, it sits to far forward in the wheel well. I have mesured the springs from the front eye to the centre bolt. It measures 24 inches, the centre to the rear eye is 28 inches. I have turned them around and either way they are to close to the front or back. The springs I installed were off a long box and I installed them on a short box. Does anyone know what there's measures. Does anyone have any close up pictures of wheel well spacing. Also any pictures with Early Classics 4 inch rear leaf spring drop. Thanks