leaf spring move

Pinion angle? Hey guys, I just moved my leaf springs in to get a little more tire clearance and I have a set of sliders on the way. I have been reading a lot of threads about how everyone moved there leafs in and what they did to get there car to hook up. Every now and then, someone talks about...

Moving leaf spring mounts on 66 Can you move the front and rear leaf spring mounts inward, narrow the rearend and widen the inner wheel wheels to make room for wider tires on a 66. Would I want to? How close together can you put leaf springs so they will still do their job correctly?