Thanks!
I moved the wheels forward for better weight distribution. It was a choice more than a need, The big truck fenders allowed for that. I could have put the suspention in the factory spot, but I used to run a race car, and thought, this is so easy to do at this point, why wouldn't I?
The big truck fenders are the same length. Direct bolt in. The wheel opening is much bigger, and the flare is a bolt on. Unmodified, the flare was actually too wide and tall(it hangs below the bottom of the fender) I moved the bolt holes over, so I could move the flares in, and shortened them up. Yes, The car front is wider than the factory stuff, and it would have been a bit off with the factory fenders. Not ridiculous, but not great.
As for the added material, the frame was about 2-3" too narrow. I didn't want to do a bunch of weld on stuff, as that can become questionable at safety inspection time, so I bolted channel to the frame to make it wider. I think if you look on youtube, I talk a bit about that in fargo truck tv episode 2. There is some underhood footage there.
The motor goes in this weekend!