I think it would actually be easier to just find another truck..... You are going to need a parts donor for the conversion in any event..... Might just as well buy a diesel truck, and sell the one you have.

 

I converted two diesel second gens to gas and it was a lot of work. I agree with HeyYou on just buying another one. My parts were readily available in a junkyard diesels aren't plentiful in the yards at least where I'm at