FWIW I have not used an IFS but for a while I searched for a bolt in IFS for my '57 and couldn't find one. I thought the Chassis Engineering one was only for AD's (47-55.1) and they didn't have one for TF's (55.2-59). A long time ago there was a thread on here where a member bolted on a square body IFS into a TF. The frame is wider then a TF so he had to put some spacers in but the rest looked like a bolt in. That crossmember is pretty substantial and you didn't have to do any welding and even used the outside of the frame rail power steering. I thought it was pretty neat at the time. There is the one from Scott's Hot Rods
https://scottshotrods.com/1955-1959-...s-bolt-on-ifs/ too. In keeping things simple and less expensive tho I wound up sticking with the straight axle.