well, I'd support the engine in the rear in addition to the side mounts.
I wouldn't run it for more than 10 or 15 seconds, I just want to get it to fire.
Like I said, this task may seem trivial to a guy who's done it numerous times before, but I never have.
I'm just afraid that I'll put my new cam in and end up having something wired slightly wrong and have to crank and crank and crank and crank before I figure out what it is.
This way, I'll figure out the wiring and the timing method for the dist, and get comfortable with it so that I can prepare to break in my new cam with confidence.