Keep in mind that with the caster corrected radius arms with a lift you will probably run into driveline issues. If the caster is set with the new arms to the original spec and you have a 3"-4" lift, the pinion angle will be too low for a DC front driveshaft to work properly.
The best bet would be to install the lift, put the new driveshaft on & measure the angles on the pinion and driveshaft. Then have the new arms made to get the pinion angle corrected so that the pinion angle is the same as the driveshaft (i.e. there is no angle on the ujoint).