350 block i.d. help please

Jason Kildea

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Dec 3, 2017
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82 Chevy Sierra classic
So I have the great casting number 3970044 which is hopeless for finding info about. However, I have both stamped numbers from the front of the block, 12K636332 the partial Vin and T0512CTL suffix code. If anyone could help that would be great.
Now some background, it's in an 82 Chevy C-10 I bought for my son (his first vehicle). So I would like to know as much about the block as I can find to know how he can build/upgrade the engine.
Thanks again guys for any info you can provide!
 

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