Dude, you're toast. The transmission bellhousing is different on the diesel and won't swap over to the gas engine. You would have to swap transmission housings to reuse your current transmission. That swap sounds like it would be a ton of work. The fuel cell uses a small lift pump to drag fuel from the tank up the the injector pump. Its an external 15 psi or so fuel pump and no pump is in the fuel tank, if I remember correctly. If you can't do the work yourself you might as well sell this truck off or look at conversion pricing close to what it would cost you to buy a new truck. I like that you don't have to do emissions testing, is that because its a diesel? Get the diesel fixed and go about using it as is.