Are you going to run fenders?

If not, moving the crossmember & axle forward 1.5" shouldnt be that noticeable. If you plan to run fenders...well thats a whole nother story alltogether.

I personally think moving the axle .75" forward centers the wheel in the fender if the car is to set low in the front. So that would help anyway. But I would caution against any more than that.

I really dont think you will have much issues as you are planning. Again, I would simply mock everything before paint, so you can plan it as you go. Tacking everything in place and doing the final welding after all clearances have been achieved should prove the best way to go.