Hi Sularus,
I did the opposite many years ago, dropping a 3.8 V6 and turbo-hydra into a Chevy that had a 4cyl and a 4 speed manual. Of course the mileage dropped but performance was fine. If you can find the engine you want in a GM of about the same age it shouldn't be too much trouble. I found a Buick at a junk yard that had been sandwiched. I had to cut the drive shaft, this was in rwd days. And there was some motor mount welding and add some front spring spacers to get the front end leveled, but really minor stuff all considered. All told it was a pretty complete drive train swap for about $1000. So I think you can do it, and maybe cheaper too.
I think it is a good idea and in the long run will save you money.
-mort
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