I did this exact swap myself. You can see my articles in the tech section here:
but in response to your question regarding TRACK width, I'd say the waggy axles are basically about 2 inches wider than stock. The spring perches are 1 inch wider, so you have to move each one in 1/2 inch (on the front, on the rear just cut em off and reweld them where appropriate), which I did in a slightly different manner than the ones noted in the above articles. But the axle itself is wider, so it will have a wider track width, all other things equal. The difference is minimal, though, but if it really matters to you I don't see any reason why you couldn't make it up with different offset wheels if you really wanted to, but personally I don't think the difference is going to be that noticable.