I agree with Dennis.
I'd have to think any truck diesel would be too heavy.
Doesn't leave much to choose from does it?
After the too small VW, Mercedes are probably most plentiful.
Get one with a turbo for decent power.
A Mercedes just might weigh more than the 56 wagon, so sounds like a good match to me if it fits in car and there aren't electronic issues.
Maybe a marine to automotive conversion?
Do a google search for diesel conversions and see how much info is out there! Especially in England it seems.
I've thought about how cool a Cummins six cylinder diesel would be in an older Chevy pickup.
(it was a Cummins before it was a Dodge -
I can hear it now: Why'd you put a Dodge engine in your Chevy?)
Probably have to be a 1 ton though to hold that thing up!


Pete
64 Chevelle
61 C30 Panel truck