As I've mentioned before, a good work-around for the oddball bolt spacing on the back of the stovebolt 6 block is a piece of 1/2" X 2" flat bar about 12" long, bolted to the upper holes in the block above the crankshaft. Attach two of the engine stand legs to the ends of the bar, and use a stack of flat washers at the lower block holes to level things out. This allows you much more flexibility as to where to position the pivot for safer rotation of the engine.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!