Hy 1936only, unfortunately my American parts books don't go back that far, my Motors manual for the period lists six engines for 1937, they range in size from 230 cubic inches to 400 cubic inches. The Motors manual does not reference engines to specific chassis so I can't tell you which engine should be in that truck, sorry I couldn't be of more help. Should I be worried that yours and your brothers collection will overtake mine in size??? Merry Christmas and Happy New Year!