The Hemi transmission cross member will work with the magnum engine. I just had to Drill two new holes for the left side frame mount. That's what I did on my 91 dakota sport frame. I am slowly getting everything to swap in a gen3 hemi into mine
I think I have your pictures saved on Facebook when you installed yours. I ordered a crossmember 1st. Then it all went on sale so I ordered another along with the hemi engine mounts just incase I ever decide to go that route.