87 VIN issue???

[Ski-me]

A few years ago I was trying to find out what engine was in my 89' K5. I found the following info on my block:

So the numbers I could find:
Front passenger side just behind AC compressor - V1112UKA
Under side on block cast - 683
Under side on block towards the top -
627
56
N

The answer I got was:

V1112UKA

V = built in the Flint plant, 11 = November, 12 = 12th day of November, UKA = 1981 350 con. cab, m/t, A.I.R. P LF5 150 2 C-30 & 3500,159.5WB

The P LF5 is the partial VIN, the 150 is the HP rating, and the 2 means 2 BBL carb.

I think this site was used for part of the number above:

http://www.nastyz28.com/gm-chevy-cod...s-suffix-9.php

So basically, I guess I have an 81' block in my 89' Blazer.