David, somewhere floating around the internet there is a pick of one on a full-size pulling tractor that apparently has 500+ whp.
I don't think one would fit very effectively on your garden tractor.
There was one for sale on another GM diesel site that I would have LOVED to bought. It was very nice!! My next truck may just be one in fact. Keep this one as the toy, puller, racer, DD, and have the 6.2 as the DD/hauler. Love to have a well put together mid-80s Chevy reg. cab 1-ton dually or CC SB with a nicely built 6.2 turbo in it. Looks are killer and hauling ability would be fine for its purpose. Wouldn't win many races but they can get the job done just the same and get pretty damn good fuel mileage all the while.
Yeah, I'm a fan of them if you can't tell.
C-ya