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I was talking specifically about your Chevy van, I don't have much experience with ford engines/transmissions. Both transmissions I mentioned will bolt right up to any engine offered in a 1993 Chevy conversion van. The 1991 K2500 Chevy with 5.7/350 TBI I converted from a 4l60 to a NV4500 cost me about $1000 total to convert, used transmission new clutch/flywheel.
It would be drastically less work to put in a period appropriate transmission into that van (like a NV4500) than to try to bolt two transmission together or to hook up an auxiliary overdrive unit. It would be way easier than some new exotic 6 or 8 speed auto. I have converted two 90s model Chevy's from auto to stick, a pickup and a Suburban with a 4l60 and 4l80e respectively. I am sure your Chevy van has one of those transmissions. The correct sensors just bolt right up, everything works fine.
If you want a more complicated project a Tremec 6060 should bolt up to the engine but may require some other custom work to fit.
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