engine swap in e250 Compatabuility?
 

i have a nice 2000 e250 (vin 1ftne2426yha63440) 4.2v6 dealer says these engines wont work 1k702aa-1 or 1k706ba-1 or 1k703aa-1 he said only 704
the place that has these engines got them from factory testing the have 1500 miles on them look like brand new and 2 look just like mine-----and i think they said 1 or 2 are 2001's
Now ? if one isnt exact cant i just take or switch computer things? they are complete engines
i just want my van back and havent had the cash to do it till now
any advice will be appreciated more than you know
thanks--Shawn