273 engine swap into a Jeep CJ5

Probably going to need to change the transmission, clutch and bell housing, or automatic trans to a 904 or 727 to match up to the V8 blocks. Then you will have to look at the drive shaft length too.

Just as easy to put a 318 in it as they are a lot more plentiful, and lots of rebuild parts available for them too. Mild cam and a 4 barrel carb wakes them right up.