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For me I think a lot depends on what I want to use the truck for.
First I don't think I would use a short bed truck as the bed is so small to hold any kind of pay load.
But if I was going to install a diesel into a SWB or LWB truck I would look at the Cummins 4BT and do more reading of this site Cummins 4BT & Diesel Conversions Forums
My brother out in CA. has a few 4x4 with the 4BT motors. He said you can tune them up to put out insane HP.
Dave ----
ps:yes I have given thought of a 4BT in my flaire side truck but the 300 six will have to do for now.