Dan - if it's really the original V8 in a 57 it's most likely the 265, as the 283 wasn't put in light trucks until the end of 57 - the first year of all 283, no more 265 was 58

265's had no built-in oil filter

Bill

Moved over to the Passing Lane

"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