I think you'll be OK, if you get it running soon. I'd add oil to the gas to get it to 50:1, and fire it up and run it long enough to get good and hot. However, I'm no mechanic, and you'd be smart to call the shop first, and see if they agree with me.

When I was a kid, I dropped a motor into the lake, and we took 8 hours to find it. We pulled the plugs, sprayed WD 40 into the cylinders, ran it for a bit, and put it away. It ran fine for 15 more years.

You may have a problem with your battery, if it got submerged. At the very least, it's going to be deader than a doornail.
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