There is more you arent thinking of.
It has 5/8ths studs, so either knock them out and use late model 1/2 jeep studs with large 5/8ths knurls or buy some circle track wheels.
How do you plan on mounting the shock?
GN snouts have the WMS 5/8ths inboard of the snout end, so a 58" housing is really 56 3/4 wms to wms plan accordingly.
Why not inquire about the version with dropped control arm mounts, or multi hole mounts.
Add in the price of a new drive shaft as well