Engines are very heavy and long so to be safe you really do need something to support the engine from both ends or the side. Here is the stand Packard made available and suggested their dealers use. It supports from the side.
https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=181039#forumpost181039 As mentioned in that other post, I built one for a modern stand similar in construction to the Packard version. IIRC, Ross has a photo or two somewhere on the forum showing something he has made. I believe his has a piece which drops down so bolts can thread into a couple of threaded bosses cast into the lower forward center portion of the block. IMO, a combination of the two approaches would be easier to work with where there is a long strip welded on top of the lower piece so the engine can bolt to the cast in threads on the bottom and also have clamps around each end. That way there would not be as much stress with bolts being only at one small location.
The advantage to supporting from the side is much less space is required and the danger of a long engine tipping the stand or breaking one of the mounting holes is reduced. There is also less finagling to find the exact mounting position needed at each end of the engine for two stands to rotate in the same plane.
Disadvantage to the side mount is the stand must be fairly high to start with. The pivot and center of gravity needs to be positionedy on the adapter so the engine can rotate easily without being off center and very heavy in one position. The height is needed so the ends of the engine will not hit the stands center leg.
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