Unless you've got a very heavy duty engine stand, mounting it with the bellhousing attached makes it very tipsy. I'd reccomend removing the trans, flywheel, and bellhousing, then reattaching the flywheel to give you something to pry against once the engine is on the stand.

Several years ago a 235 with the bellhousing attached tipped a stand over in my school shop, and a kid needed 37 stitches to put his foot back together. He was wearing heavy work shoes, and still got some major damage when the engine fell on his foot.
Jerry

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