* 1994-1997 Ford 7.3L Powerstroke Diesel Engine: This engine is a significant upgrade over the 7.3L IDI, featuring a turbocharger, intercooler, and electronic fuel injection. It will require some modifications to the engine mounts and fuel system to install in a 1990 Ford, but it is possible.
* 1999-2003 Ford 7.3L Powerstroke Diesel Engine: This engine is even more powerful than the 1994-1997 7.3L Powerstroke, and it features a number of improvements, such as a higher-pressure fuel injection system and a variable-geometry turbocharger. It will require extensive modifications to install in a 1990 Ford, but it is possible.