Lot of assumptions in this thread, given the poster's location.
* US market car, or other? Not all '83s got computers
* 3.8 could also be 229 Chevrolet engine, 231s are pretty uncommon in Malibus
* Verified TH350? See first bullet point......Could be TH250, TH250C, TH350, TH350C, or even a TH200 or TH200C if just going by pan shape rather than bolt count/band adjustment. etc to lock down what trans is actually in it. Again, will depend on how car was originally configured to get an idea of what OE wiring is or is not present
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