The sideways approach for "safely" mounting a six to a stand was described in the "Tech Tips" of the Sept/Oct 2003 issue of the 12 Port News by Ron Sneddon. He fabricated an adapter plate to mount the engine sideways, to keep the cg near the rear wheels. Ron also describes a method for finding the cg of the block assembly.
As I recall, both Ron's and Sam Welch's version of the stand were for the 250/292 sixes, not real Stovebolt engines. It's not obvious haw to easily mount a 216 sideways.

Hoyt