What's wrong with the traditional jack stands, a piece of plywood, some wood
blocks and a floor jack?  You can build a simple cradle with the wood blocks
is you like.  It has worked well for me with a stock engine, a tiico I-4, and
a Subaru Ej25.

If you want something to just hold the engine in place while you r&r the
transmission, use a 2x4 with a hole in it, a large eye bolt with washers and
a nut and some quick links.