mtrain
+1y
It depends. Do you want an engine that you can just install, and not rebuild?
If so then the top of the line 5.0 would have to be one from a 93 Cobra.
This engine had all of the factory goodies at the time. The GT 40 intake, bigger injectors, GT40 heads, and a bit more aggressive cam. Ford did make quite a few of these Mustangs so finding one shouldn't be much of an issue.
If you can't find a 5.0 from a Cobra, then the only other choice would be just about any 5.0 from 87 to 93. Not much changed on these engines except that mass air was added in 89. The 87-88 engines were speed density which made more hp than the mass air engines, but you would have a hard time modding them over a mass air setup.
Personally I think I would go with a newer mod motor. The Cobra engine in particular since it had a forged steel crank, quad valves, and cams. These engines are really smooth, and will handle quite a bit of hp, not to mention the wow factor under the hood.
I believe the mod engine would fit fine, and if your really lucky and can get one for a good buy I would get an 03 Terminator Cobra engine. These bad boys had ALL the good stuff. Manley forged rods, forged pistons, forged crank, and the supercharger.