1997 Chevy Tahoe Won't Start - Fuel and Spark - what next?

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My 97 Chevy Tahoe (5.7L, 180K miles) hasn't started since the BIG snow in Chicago, no problems prior to this. Had a little bit of snow in the engine compartment, but nothing more than you expect from a normal snow storm with a little bit of wind. The fuel pressure is approx 50 psi with the ignition in the on position and increases to 60 psi when cranking. Also have spark at all cylinders and fuel entering the cylinder that I checked. Where should I go from here?