retorque heads to solve issue?

Obviously something is amiss if I'm getting some soot on the block so my question really is: "I probably need to retorque the heads but should I simply remove them, replace the gaskets and re-install them"? I have to remove the headers in order to get to the head bolts so I'd rather do the job once, not twice.

I've read that you should retorque aluminum heads after break-in, but my motor already has some mile on it. I was wondering if simply retorquing them might solve the problem. I would obviously retorque them in the proper sequence.

Also, are you saying that I need to drain all the coolent out if I'm simply backing off the bolts a few pounds then retighting them?

See post 7