You will likely also have to replace the galv steel fuel tanks, gauges, add fuel lines, increase engine room vents, etc., etc., etc. I really wanted diesels also. I looked into this last year on my Roamer and it looks like at least a one year project with extensive unknowns and unknown costs. Likely not a good return on efforts. I've had both my big block MoPars rebuilt for $10,000. Look at all parts of the project.