If you had asked beforehand, I would have recommended the 1,000 pound stand just for rigidity. The 750 will hold the engine, but more than likely you'll see the bock start bouncing up and down as you work on it. That happened to me when I was building AMC V-8's, which were similar in weight but shorter. What I did was cut a lenth of 1x3 wood and wedged it from the front leg of the stand up to brace the end of the engine. I had to remove the prop to rotate the block, but then I put it back in as soon as possible.