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What's with the deadline?
Also those options don't seem mutually exclusive.
However now that you've written them out, it looks like this to me.
Both the engine and transmission are out of commission.
Therefore no advantage in leaving them them in. Unless these are in-car fixes.
If you come across a known running replacement while you're investigating and fixing - that's a fork in the road.
In the meantime, that fork isn't there to take.
You really want to change engines and trans. Any way you slice it those are longer term projects.