Hi Tango, I live in Florida USA. I have a couple of short buses, a 55 Ford B500 3 window, and a 54 Chevy 4500 3 window. Both have Wayne bodies. At the moment, I am looking for a newer engine for the Chevy, which has the original 261 in there. I was going to put a Cummins 5.9 in there, but rethinking the whole thing after seeing how far you had to set your 4BT back behind the firewall. How many inches did you have to move the 4BT Cummins back? Is there any hope of putting a 6BT in there? Thanks, George