I am hoping to do this swap on my 65 a100 pickup as well. Reading the one link that you attached a 5.7 Hemi valve cover to power steering pump on drivers side is 26".

Seems like that should we well within the width of the current engine compartment. I am worried about the heat issue the truck cabin would be on fire at 200 degrees coming off that motor. Do you think you could spray the engine cover and compartment with lizard skin and keep the cab cool?

Craig