the 283 was an optional engine for 58 [55 up really, and any small block], so likely it'd fit in a step van, but you may need some mods to accommodate the dog house
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics