Speeding up an H van....

Has anyone ever heard of or, even better, attempted an engine transplant in a Citroen H Van. As a potential project im thinking of trying to put a more economical and capable engine in one. Any ideas or suggestions would be appreciated. Im looking at the diesel side of things.

Cheers

Here are two sites of H clubs :

http://deuch.chez-alice.fr/typeh.html

http://www.hvan.co.uk/

You could find informations here.