Depending on what year of CJ you have, you may have problems with the overall length of the engine, fan and radiator. I've installed Chevy 250's in a Willy's PU and Wagon. They with a little more room than most CJ's and I had the same problem. It required modifications to the firewall and radiator mounts, moving the trans/tranfercase back about 1 1/2"s. If your CJ originally came equipped with a straight six, you may be okay.I had plenty of hood clearance with the 250, but I know a 292 is a bit taller. Just a "head's up" on that one.

I used Chevy V8 mounting kits and adaptors. It pretty straight forward.
In case you're wondering, a 250 worked great!!

Good Luck1