I have a 1994 mitsubishi diamante LS, 3.0L 24 valve and i need to replace the engine. what will fit, can i bolt up a 3.5L out of a 1999 ?
The local auto scrap yard will have the listings of what will fit your car either the exact fit or the closest fitting engine.
You could possible fit the 1999 engine but you will have to do a lot of modification.
If you have the knowledge to do this it could be a great project, if not stick with the engine that belongs to the vehicle.