Use a chevy turbo 400. (I think thats what its called)
This guy did
He was given a 1500hp guarantee. The guy said the tranny in stock untouch form is worth 800hp. Im not sure what all is done to it, but he was using a factory style tranny that came with the truck, but expensively upgraded to handle the power. Well....it didnt hold up. Long story short, it was junk compared to what he has now. Many folk tried to inform him going the chevy tanny was the cheapest best option. The thing is an absolute rocket!
Correct me here if im wrong, but I do believe this type of tranny uses a tv cable on the trottle body? He had a manual valve body installed, so no cables, no electronics, but he did have to buy a floor shifter.