swap candidates

[firegod33]

The time has come to either swap in a diesel or rebuild the gasser for my Jeep project. I have a '67 CJ5 with the Buick 225 V6. I'd love to go diesel in the old Jeep. The problem comes with availability and adaptability.
I'm planning to put a NP435 in the Jeep as well. In a diesel, I'm looking for something readily available. Nothing exotic or hard to find (or find parts for). I'm also pretty set on using the Ford 4 spd. (an SM420 would also be a possibility)
I'm pretty much stuck with 4 bangers, due to space limitations, but if anyone knows of a small V6 diesel, I'm open to it.
Suggestions? :

 

[Pipeliner_86]

Cummins 4bt, or 4-cylinder perkins. Both easy to find and will fit. Some websites out there with info on the cummins swap.

 

[argve]

Those were the ones that came to my mind...

The 4bt is really common in delivery trucks (bread trucks and the like).

 

[tonkadoctor]

Cummins 4BT