AD power steering or IFS

[ADBob]

Another question related to putting a SBC and 700-R4 in my 1950 1/2 ton. I have read of problems using the typical power steering kit like CPP sells that mounts a newer box to the frame inside the wheelwell for these trucks. The stock box won't fit with a SBC. Is there a power steering kit that works well with the straight axle or should I just spend the extra to go IFS? Looking for a mild drop, maybe 3 inches or so from stock. Looking at the build threads I know these are really basic questions for this group but this is my first try at a truck this old and I want to do it right the first time.
Thanks,
Bob