I dont post very often, but felt i needed to weigh in on this one. I have a 1996 Z71 and I have been down this road. Take it from me and skip the IFS lift. Bought my truck stock in 1998 and eventually felt the need for a lift. I went with a 4 inch pro comp lift and 33" tires.
It did make wheeling better due to the added clearance and the kit is pretty strong, but you are going to destroy ball joints wheeling a truck this heavy with oversized tires. A 2500 would be ok due to the heavier control arms, but you cant swap them with the 1500 control arms b/c the brackets are different. You may also blow your front diff apart if you wheel it hard enough, not to mention the actuation on it sucks sometimes in cold weather. I never did have issues, but I have seen it. In addition you are going to find that while the 33's are better, you are going to want just a little bit more. Based on this I decided to SAS it.
The truck is super tough now, much lower maintenance, and far more capable. It is lifted ~7 inches and is running 35's. It has settled some since this photo. I used a high pinion D60 from a 89 Ford dually and converted it over to the single rear wheel hubs. ORU makes a kit for this axle on our body style trucks and you the 36" spring pad axle is far cheaper than the 32" axle. In addition, it does better on the highway due to the wider spring pad while losing very little articulation. In my opinion the ORU kit is way over priced for what you get. Fitment sucks which required some light massaging and ORU customer service sucks. They told me they were going to give me an end of the year special 20% off, but when i got my CC bill, they charged me full retail. I fought it and called multiple times, but never got anywhere with them. Basically got screwed.
The truck doesnt get wheeled very much right now and is a daily driver due to having 2 very young kids. With over 200K on the truck, i am now getting ready to replace/rebuild the engine and transmission. While it is apart in the garage, i think i am going to ditch the leaf springs up front and either use radius arms, or link it. Still trying to decide which route to take.