273 engine swap into a Jeep CJ5

I put a small block mopar in a CJ-7 years ago, nothing bolts up, used a NP435 from a Dodge truck and 203 transfer case, the rear driveshaft was so short, that it would fit in a shoe-box.
The CJ-7 has 12" more wheelbase than a CJ-5.

What 4cyl is currently in your jeep, the old iron duke? If so a Chevy engine will bolt to the bellhousing.