The 4.0L is not a "modular" motor.
The 3.8 and 4.2 are more modular than the 4.0L since they share/can interchange so many parts.
Featuring Superchips Custom Tuning products
'99 4.2L 5-spd, Powerdyne, CNC'd heads, 211/.523 cam, 70mm TB, 1.8 RRs, JBA headers, custom X off-road, 90mm SCT, 60#s, Mach I duals, Ripper, PHP 8.8, Steeda UCAs, LCAs, 3.73s, Alum driveshaft, 245/45R17s on Silver Bullitts
11.3 @ 122 (ET Streets)
465 rwhp/460 ft/lbs (25hp dry shot)
12/00 MM & FFs, 7/01 5.0 & Super Ford, 2/02 Hot Rod