There is a guy running around my town with a early 2000s Cummings truck converted to a GM 350, but he used a GM trans as well.

Could I do? NO, but at the same time I had little reserve on swapping a 318 in a Chevy truck to replace a tired 350 once.

Probably would have gotten a better response from a Chevy board then a Mopar board.
Bottom line, its your truck, if cheap is the goal, buying a turbo 350 is probably cheaper then buying an adapter, and you could sell your rebuilt 727. Gene