Roachie is giving you good advice!!!. If your realistic it will be fine. I have seen a lot of HACK job swaps, which in my opinion are worth less then a truck with blown engine ..as they take a lot to redo and fix.... to be really nice, the only swap I'd do would be '08-'09 common rail 6.7 Cummins. So the swap is legal and easily sold in any state. I would only do the swap if it's for yourself..if your just flipping the truck I'd just do the 6.4L crate long block, or sell it as is. The Conversions take ALOT of time and it would be hard to recoup especially if its done right and its your first one etc...is the F550 a stick? or 4x4? Aluminum wheels, crew, extended or regular cab..etc etc.. I may be interested in the truck as is..
Thanks,
Deo