Rotating engine on stand

[rockdogz]

I have an engine stand rated for 1000lbs. I have a 502 big block on it, and I need to turn it over to replace the oil pan. I'm very nervous about doing this - the whole thing is just held on by 4 (grade 8) bolts. Doesn't seem like enough to support something this massive. Anyway, do I need to be concerned at all? Is the engine relatively balanced so that it won't be too difficult to rotate?

I've been keeping the engine chained to the hoist while it's been on the stand, just as a fallback. If someone could let me know if I have anything to worry about then I'd be most grateful.

Thanks,
Tom