Suggest some of the inquiries be submitted to the incredible 42 page, Step Van thread on the H.A.M.B. forum I posted the link to. It is w/o a doubt the best concentration of Step Van knowledge I've yet to encounter.

Wish FORD would develop something like a turbo charged "3.7L Hercules 3.7 Diesel" option for E-Series.

Also came across a very informative Diesel Forum, but unfortunately neglected to Book Mark it.