Water in engine after rebuild before first start.

[Locutus]

As most of you know texas has been hit with some pretty heavy rains lately. I did a rebuild on my motor a couple of weeks ago but didn't get a chance to put it back in the truck till this last weekend. I didn't get the hood back on yet and the valve covers are not on yet. I had the engine covered with a tarp and someone moved the weight I had holding it down. Last night it rained and blew the tarp up and I have water sitting on the engine and some in the head in the rocker area. I am sure some has drained into the pan. Do I just drain the water from the oil pan and go on or do I need to do alot more before I start it the first time?