running 55-57 small block

[jerry moss]

the 72 K5 blazer we picked up as a "parts truck" for my dads 71 K5 has a clean small block in it but after checking the code on the front of the block it shows an "F" code which according to my book is either a 55 or 56 car 265 or a 57 car 283, both with a 2bbl carb. i haven't dug into it enough to get the date code. i figure it may have value to someone restoring a 55-57 car but not sure what it might be worth in running condition. i know it's not a truck part but hoping you guys/gals might be able to to help put a value on it, any ideas? it also has older heads with no accessory holes and a 2bbl intake with the hole for the oil filler in front.