Here is a 2.1L (long Block) with stock Digifan & cooling parts)
http://www.benplace.com/amc_head/amc26.jpg

Here is a 2.1L (long block) with stock Digijet & 1.9L cooling parts)
http://www.benplace.com/bjp/PICT0014.jpg

I see no difference powerwise in normal driving condition, only some wile
climbing.

Another thing, i see way more damage 2.1L (heads, rods...) than 1.9L with
about the same millage (and that is fact after 55+ motors rebuilt/reseal in
one year). If you are unhappy with the van (1.9), sell the van or put a Subi
inside.... way more power and reliability... in my opinion... not that those
engine are not good, but they are old and GOOD parts are getting dificult to
get...

Lately... all transmission that i see are marginal... (axle bearings, roller
bearing and seal, syncro mesh... )

So investing in a Subi conversion means a rebuilt tranny.

Those vans are getting old.... and that is a fact.

Cheers, Ben
http://www.benplace.com/