To answer this question will get you mixed reviews as neither a body lift or suspension lift is right or wrong.
This will all depend on what you wallet allows
4" suspension lift will obviously correct your CV angles now as Im sure they are thrown off by the Bilsteins.
It would completely straighten them (assuming you are at 2.1 or 2.75) but it will adjust the angle due to the drop brackets you get
With the 3" body. Your CV angles will NOT change from what they look like and are now. Simply because you are not touching the suspension, rather lifting the body off the frame
I have a 6" lift and Bilsteins at 1.4 and my CV's are almost straight. Id say they are equivalent to how stock rams come (compared with a buddies stock ram)
if you do a 4" lift and depending on the 4" lift you will need to set your Bilsteins at 0.7 or 1.4 to be level and I can guarantee your CVs will be far better than how they are now.
0.7 - if you get a 4" kit with the 2" rear block
1.4 - if you get a 4" kit with the 3" rear coil spring
Hope this addresses your question.
I would throw up a pic, but it does not fit what you are asking....unless you want to see how my truck looked like with the 6", 2.1 Bils and 3" Body lift....lol
Others will chime in here with pics
But any questions, let me know