If the engine is doing that dead fish flop, you don't have the stand pivot centered properly. I use a piece of 2" by 1/2" flat bar about 16" long and bolt it across the upper bellhousing bolt holes so I can spread out the engine stand arms and move the pivot upward until it's about 3" above the centerline of the crankshaft. That will cure the top-heavy problem and make the engine easier and safer to roll over when you need to. One of my students needed about 40 stitches when a stovebolt engine landed on his foot after flipping a stand over. The kids had mounted the engine and bellhousing assembly together onto the stand, making it front-heavy. The kid was wearing a pair of heavy work boots, which probably kept him from losing a few toes.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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