Truthfully I should just leave it alone and keep wheeling, but I like to build things and a SAS is the next logical step. I don't have to do it, but want to. I will likely not swap until after this year since I can't find the time to do it at the moment. I figured skip over the leaf spring swap since I have less in parts to do the 3 link setup than buying a kit. A stock solid axle truck is also not going to perform like a swapped IFS truck, you will need a new front spring hanger, aftermarket springs or RUF, IFS steering box, and hysteer.
With the IFS models you get more bang for your buck in my opinion, typically with updated interior (if you care, I don't), the correct steering box, fuel injection, potentially lower miles, little to no rust, AC, etc. I think the IFS is also stronger than the stock solid axle and steering setup with the j arm. I wheel with a guy running a stock front axle other than hysteer and taller springs, he has broken a number of axle shafts, whereas I have broken nothing in my front end and would say I am much more throttle happy. Last time out on a hill climb it started to rain and the rocks got slick, the IFS wouldnt give me the flex I needed to crawl it and ended up doing a 3rd gear dump in double low and bounced my way up with two tires 2' off the ground several times. Not a problem. Buddy tried it and blew his ring and pinion. We have all been surprised by what the stock IFS has taken abuse wise.
In my area, I have seen a handful of 85 and older trucks, all but one were rust buckets and not worthy of building. There are IFS trucks all over and you can pick and choose. My truck only had two small spot of rust on the body and one on the frame, which were easy fixes.