Just buy the cross member, no need to make one. There are several places that have them.
Windsor fox had some shift linkage for sale, but it appears he screwed enough people, that he is finally out of business. I managed to get one of the last ones for the shifter before he closed up. You might find someone like texas mustang that might have one on the shelf. While I was waiting for mine, I did make up one from the AOD linkage along with the stock C-4 linkage and it worked great too... even more adjustable than the WF unit.
Not sure about anything else, as I have an 8.8 in there and I had to have a whole new driveshaft, but I am sure some one will speak up.
Good luck