Don't go full hydro! Go hydro assist. They sell boxes with the holes in them but there spendy. You can drill and tap your own box to make it work. Just need to research how and where. I know it's possible because a friend did it worked awesome.
Edit: I just reread and missed the rear steer part...
The 7.3s sound like that ^^^ and the duramax sounds like it's screaming lol but they both sound like each other allot because they share the same firing order.
Trade? Lol, I have a nice 14"wheel I took off my 78 and put on a crusty sticky one from a 73. I think it's a grant. Black grip w/chrome. I'll find it and post pictures
I like them both for what they are but the black one is too modern for me lol personally like the comfort grip and like it's look and that it's 15" but I like big steering wheels lol. The one in my 59 viking 60 is huge lol watch your thumbs.
But on the other hand the black one is more truckie
I have headers on our daily burb 1999 vortec 350. the ones I got are stainless steel and were cheap. They look good and have a thick flange. I battled loose bolts for a good while and ended up getting stainless hardware to cure it and its been fine the last 3+ years. I have had headers on...
Electrical pipe/ conduit is straight thread if that helps. Back a long time ago all pipe had straight threads and when they came out with tapered they gave it to the plumbing world