I really like the look of the flaming river box, small fast ratio, what's not to like?
Unfortunately, the two boxes mount completely differently. When I first saw the flaming river chevy box, I thought, "I can make that work." Unfortunately after looking at the way the boxes mount it becomes clear that they are completely just too different.
If you were to try to make the Chevy box work, you'd need to do the following.
1. Cut and notch and box the K-Member to allow the Chevy box to fit down inside the K, at the same time create a mounting pad for the box. The Mopar box mounts perpendicular to the front wheels, while the chevy box mounts parallel.
2. Find a Chevrolet pitman arm that is the same length as the mopar pitman arm, with a similar rod end to connect to the steering linkage. Otherwise you'll need to take a Mopar pitman arm, weld up the hole where it connects to the steering box, and have a machinist cut a new hole that will fit the chevy box.
3. Create, a coupler to connect the chevy box, to your mopar steering column.
Now there are guys on this website that could do that level of fabrication, unfortunately I am not one of them.
Regards,
Joe Dokes