Need Help Identifying an engine
 

Hello everyone, I hope someone here can help me ID an engine I have sitting in my warehouse. Our neighbors moved out and their sales manager didnt want his old car parts anymore so he just gave them to me, told me if I sell the $ is mine. Among the parts was supposedly the original engine to a 71 Corvette. I have been browsing online, but I am finding conflicting opinion on what it is exactly.

Here are some numbers I got of the engine

CODE on the block 3970010

Code on the heads 3973487

the engine is also stamped with what looks like CJK