James, just a heads up for interchange potential issues.
First, I can tell you that the engine that 23ballistic has will be great if it is anything like he keeps his vehicles. Top notch all the way.
That said, you have a 2001. Below are the options for your years. If yours is a Job 2 and newer as well as 23ballistic's then it should be just a matter of swapping out some external parts. If you have a Job 1 and he has a Job 2 then you will run into some issues. Some of the parts are actually on the other side of the engine..
6-245 (4.0L, SOHC), LHD, exc. flex fuel; (VIN E); Sport Trac, thru 7/23/00
6-245 (4.0L, SOHC), LHD, exc. flex fuel; (VIN E); Sport Trac, from 7/24/00
Hope it works out for you.
If not, let me know, I'll get some prices together for you.