In order to move your axle 1" forward, you need to drill the mounting plate / casting 1" further back where the spring mounts to the axle. You will also need to make new retaining plates, (plates that go overtop of the springs) to account for the relocated spring pin. After you get this done, you will notice that, YES, that drag link is WAY too short. This is the time to go cross over steering. I am making mine right now for my Dana 60 an it appears to line up o.k. One last note: the pinion angle is going to go further down unless you put a shim in there or mill the flange. Roughly, 2 degrees from where you started. I went ahead and put a 1410 u-joint on my axle to allow for more angularity.
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76-82 Chevy Pickup / Blazer - K5-K10-K30
90' TBI
TH 400
203 / 205 Doubler
Dana 60, Corp 14 - 4.88'd - Detroit Locked