Hey shut up...
I'm in the planning stages of this right now. There are no kits. In fact, to my knowledge, NO ONE has ever swapped a 4.9L (300) into a Ranger/Bronco II/Explorer. You *might* be able to get away without cutting the front wall or firewall if you run an electric fan, but I wouldn't bet on it. It's a tall engine too, I'm probably going to have a custom hood made of fiberglass to clear it. I'm also lengthening the front end to clear it. I'm going to be honest, this project is going to be a real money pit, and will take a lot of blood, toil, tears, and sweat. My suspension plans include coilovers, so what I'm going to do is build the engine cage to mount the coilovers in such a manner as to allow me to mount the radiator further forward. Even with this and the serpentine belt assembly, I may not be able to run a mechanical fan. As far as trannies go, I have an auto, and I like having an auto, so I'm going for a Lentech AOD. Any tranny that will fit a SBF will fit the inline-six. Good luck on the swap if you choose to try it.