Doe any have a suggestion on what is a good candidate for a diesel to put in an fj60? (Not really wanting to put a land cruiser diesel in it)

 

I have an OM617 (5 Cylinder Mercedes Engine) in an FJ80; but most would find it under powered. A 4BT cummins (dampen the vibration well!), or an OM603/OM606, seem like good candidates. A 6BT seems a little large, but folks put them in the 80's