How bad is it?

So I attempted to fire up my 360 for the first time yesterday. It started just fine but then died about 10 seconds later. Then I notice that there was a coolant leak coming from the aft part of the intake manifold. The leak was so bad that when I poured coolant in the radiator it started to pour out of the back of the intake. I took off the manifold today and found out that coolant had leaked inside the valley as well as into some of the intake ports. So Im pretty sure there is some liquid inside a couple of the cylinders. Just how bad is this? can I simply drain everything and replace the intake gasket with gobbs of silicon? Do you think it is the head gasket? Im using the fel-pro gasket set. Ive been busting my balls on this project for the last three years and the night I finally try to start it... this crap happens. I have 39 days until I set sail so is this something I can fix before then? If not... Im screwed. Please let me know what you guys think. If its as bad as I think it is then what are my options?