Your Engine Serial Number is FO4TILB - that code was often used as a title/registration ID.
In 1957, the LB at the end indicated a 3100-4000 series truck with RPO 408 (265 V-8) or RPO 409 (265 or 283 V-8)
http://www.1954advance-design.com/chev-specs/1957-t-ser.pdfFO4TILB
F = Flint, MI engine plant
O4 = ?? = should be a month number = 4
O4 = 4 = April (which supposedly should have been just a 4, but a O4 or 04 might have been used)??
TI = ?? = should be a day-of-month number = 11th??
We cannot determine the year of the head/block casting without date casting codes.
You might have a replacement engine/block - any Engine Serial Number could have been pressed into the block
