2.5 engine swap?

Basically i want to know if a 2.5 from a 91 Chevy s10 will fit in a 1986 Jeep Cherokee with a 5 speed tranny?

No.
The 2.5 liter Jeep engine is completely different than a 2.5 Chevy engine. They are not interchangable.

thanks alot for your help. i'm not a jeep guy i was just asking for a friend of mine.