I recently bought a 1970 Chevy LWB truck. I was told the motor is now a sb 400, but I want to know what car it came from, year, etc. I found C9F421240 stamped on the block behind alt. above the bracket. Both sides have a plate with 010 under the heads, & there is an S on the side also. If any of this is usefull, please let me know what you can.
Thanks,
Blake