The s10 was powered by an Isuzu diesel at one point. However, since your specific vehicle came from the factory powered by gasoline I think its different. I don't think its a truly "legal" swap.
If you talk to some private inspection facilities, they may just hook it up to the sniffer and ignore the diesel knock and not look under the hood. I would imagine you could get it to pass emissions. I don't really see anything wrong with it as long as it meets the standards of that vehicle, but I don't think the state feels the same way.
What year truck is it? If its an '85 or older you could look at a classic registration. But I think the DMV played with the rules on 'historic' QQ registrations
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