bellhousing

Hi, I'm new to the jeep world and already want more power haha.I have a 1981 cj5 with a 4 cylinder 4 speed and I'm looking for the EASIEST, SIMPLEST and most common rout to take when you wanna swap out a 4 banger motor and bellhousing out for a v8, but want to keep the 4 speed? should the v8 be...