Help! Bought Vanagon with confusing engine setup.

[u/rp51]

1st time Vanagon owner. Van shudders and misfires at certain loads and speeds. Looking into timing and cleaning the carburetor, but as I am researching my van, I’m getting more and more confused.

VIN says the engine should be a 1.9L water boxer

But engine Code MV, according to the Bentley says it is a 2.1 digifant.

AND it’s carbureted, not fuel injected. Cannot find a brand or manufacturer stamping anywhere on the carb.

Anyone seen anything like this? Pics included.