The 03 Sport is kinda limited on engine swap options.
To keep the swap LEGAL, the only real option you have is the 4.6L 2V...
I know they were put into the SportTrac, but I'm not sure what changed under the hood to fit it in there. The sheetmetal on the outside didn't change, but that doesn't say anything for the inside. I know that doesn't help YOU much.
Ryan