interchange engine blocks on a b

I have a 1946 styled b with a bad block. It is a 1700 number block. My friend has a 2500 number block in good shape. Will the blocks interchange ?
 
Thanks, Do ypu know how I can tell which block numbers would interchange. Is there a site or does the stamped number on block have to be exactly the same ?
 
I think that block will fit but it won't have the 4 bolt holes underneath . And I would guess the water neck will need the pipe changed a little .
 
i have two blocks one is std boer the other is .045 over and i have the pistons for it will sale the std for $225.00 over size and pistons for$275.00 plus shipping cost apply to both
 

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