I'm curious - how did you determine that each spark plug wire sparked "when it should?" In other words, how did you determine that #1 fired when it was supposed to, as opposed to firing when it wasn't supposed to?
Anyway, if you have fuel and you have spark, and I'm going to assume that your compression didn't disappear in the few hours that it was parked, then you're down to air and timing.
Some blockage in the air handling system? Jumped timing? You mentioned the timing belt was tight. Did you confirm that it's actually turning the camshaft?
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