To really know if it will cause problems you'd need to know if the previous posters rotated their pinion up or not. Also if they turned the knuckles if the pinion was roated up. Spring heights (thicker packs) can pose problems as well.
If you plan on going high steer, moving the axle forward can also cause clearance problems between the tie rod and drag link with both of them above the springs. Especially with thicker diameter tubes.
Ryan