Where did you get the supports for the engine mount area on the engine test stand? They look like angled or mitred pads of some sort that can move to various angles.
The motor mount is nothing special really. Just a basic one from Advance that fits most Chevys. Don't get me wrong, motor mounts are an important piece of your car and you should never choose price over quality, however, since this is only an engine test stand, I went with the most inexpensive option.
Below is a link to the one that I bought. I purchased mine in store, however, it looks like you can get a better deal off Amazon. Hope this helps. Good luck with your project.