Late to this one, but it is not a difficult swap.

The exhaust is cake with center dump manifolds, and truck headers can be used with a little massaging to the firewall on the passenger side on some brands of headers. Use two passenger side Jeep CJ frame mounts for the motormounts, and then standard sandwich type isolators on the engine. No welding required.

Your tans/tranfer case fitment will be where you will have the most head scratching; I used the 999 guts and tailshaft housing from the Jeep and a small block 904 case to mount up my D300 when I built my Scrambler with a 360.