I need help to identify my chevy engine

[Jerry Lizotte]

block cast number is (3970010)
Numbers stamped on head deck are (ko4 13 ckj)
3€€21283.
231517240.
Hope someone can help me out.
Jerry in Ontario Canada

 

[63Half-ton461]

The block casting tells u its a Gen 1 ... 2p-rms 350 block , maybe a 4 bolt main.

The stamped numbers are normally found in the Factory service manual for the specific year which is cast in the block in the same location as the 010 casting number.

The casting number on the head can tell you more ... what casting number is on the head ?