Those are REALLY REALLY RARE!!!!! if it was 1.9 TDI swapped in it or even a 1.9L IDI its probably worth over $4000.. my mech tdi rabbit pickup went for $3500 and these diesel double cab pickups are tens times more rare then a rabbit pickup !!!! do a serch and check them out.. mileage would be in the 30mpg range.. top speed may be low the transaxles had low gears in them probably top out a 70-75mph ...and you could get a syncro 4wd system too those double cabs are even more rare.....
If you can get it for under $1500-$2000 you are doing well.
Thanks
Deo