Ok, heres my predicament. I have 2 mustangs, one is a 4cyl. 5spd with a saleen body kit on it, no rust, and looks almost brand new. My other stang is a 5.0, 5spd that has some rust, a pretty badly dinged up rear-quarter and is looking kinda tired. The engine only has 100k on it. I was wondering, how big of a task you it be to swap drivetrains in the cars. Is it even worth it to do that?