A tangled web of two 87 diesels

[96E300D]

Hi Guys, tell me if this makes sense....
My dad has an 87 300TD with a bad head. The only heads I've found are new, the cheapest, $1750. I've located another 87 diesel, this one however is a SDL. On this car the head is O.K. but it has a bad cylinder(still runs). It comes with two drivetrains, the extra engine has a bad head but apparently the block is o.k. Now, here's where it gets a little complicated... I've also found someone who "may" have a complete engine for under $1000. What I'm considering doing is putting the complete engine for under a $1000 into the SDL and then taking the head off the current engine and putting that on the 300TD. I would then have one completely bad engine, two transmissions(I don't know the history on these yet) and hopefully two running diesels.
What do you think??
Matt