SBC Engine numbers

[Sun Baked]

I have a crusty engine in my 1965 C10 and having a heckofatime finding what it is and if I keep it old school or trade it for a complete LS 5.3 / 4L60E setup a guy wants to trade.

I'm assuming the 1st couple numbers but what I can read is 70010

And under the alternator is two sets of numbers as follows:
V0429TDB
C8A168256

that's where it gets me, why would there be multiple?
Is there somewhere else I need to be looking?

Thank you for letting me pick your brain.