When I did my 235, I just used the Cheap Harbor Freight stand I had, I wouldn't do it again without some modifications. Although the 235 is close to the same weight as a smallblock (What these stands were designed for) They are much longer so you end up with a lot more weight hanging out there. A buddy of mine who's building a 302 Extended the T Shaped piece that normally has the "Front" wheels out another foot or so and extended the sides of it out wider so it's the same width as the back wheels. It's a lot more stable than it was before, and we've talked about adding a piece to the front to support the front of the motors weight too.
And on rolling them over, WATCH OUT!!! I rolled mine over by myself using an extension to the pipe and about halfway around I still thought I was gonna loose the whole thing.. I was really lucky. I wouldn't roll one over with a standard cart with the narrow front wheels ever again. These engines are really top heavy on these stands.
MONGO