Engine I.D.-HELP

I have an 84 chevy shortbox silverado, the truck came from georgia with a transplant engine already installed i need help figuring out what year and what this engine was originally in. i have took numbers off the block
already but i dont know which ones are which. the numbers i have are 3870010 and i took those off the block on the drivers side right where the engines mounts with the tranny. the second set of numbers i have are from the passenger side and were at the front of the block just under the valve cover and C(Aor4)U192819 and the other set was VO 05TKS...
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