2.1 Carb options.

[haz]

Ive tracked down a 2.1dj, its not in a van an some parts of the injection system have been taken so im looking at carb conversion options.

I know i could swap my 1.9dg carb an would need t3 manifolds for twin carbs (an some port matching) but that aside what would be good options to run a 2.1 on, i will probably port the heads an maybe switch rockers an cams but wont be a full race build an would like a mpg of around 20mpg or more if driven sensibly, (is that possible?)

P.s any guides on prices second hand?

Hope you can help.