engine info

I recently purchased a used sandrail with a Chevy V-6 4.3 engine. On our maiden trip, it spun a crank bearing (most likely due to oil starvation) and I am rebuilding it. I have no info about what year, model etc. on it and I am hoping that someone might be able to give me some info or perhaps a link as to what I have, so that I can purchase the correct parts.
Here are the knows;

on block are raised cast numbers;

H025
10227196

on the side of the block is this metal small metal tag;
GM 12366016 remanufactured.

Stamped into the block on mating surface to manifold, next to water pump;
T0816ABB