350 Identification

[Epiparkour]

Hey guys I’m new here and I was hoping one of you could help me identify my engine. I’ve seen that using a combination of the casting number, vin, and another number stamped into a flat part in front of the passenger side cylinder head will give information regarding the factory the engine came out of, the year, and the original car/truck it was in.

The only problem is I don’t know how to apply that and what my numbers mean exactly. I’ve seen that the vin is supposed to be number number letter then a string of 6 or so numbers but mine appears to be letter number letter then 6 numbers, so its got me a little bit stumped.

Sorry if this seems like a stupid question but this is my first 350 rebuild and I’d like to know a little bit more about my particular engine. The casting number is 3970010, its a 350 from what i believe to be late 60’s to early 70’s and I have included a picture of the codes in front of the cylinder head.

Any help is appreciated thank you guys.