I have 1964 Dodge Bus that I will eventually start working on. Overall length is about 28 ft. I have. 1994 Cummins donor that will go in the truck. The engine will be built for around 400 hp. We just got done rebuilding the 47rh transmission for it. It was built with upgraded parts and is listed as a 485 hp capable transmission kit. Is this transmission after upgrades worth using in the bus? Is it heavy duty enough or should I lean more towards an Allison? Thanks for any insight. Attached are a few pics of the bus, donor truck , and my other Cummins swapped truck. Thanks in advance!