Puzzling junkyard engine

Hi,
I've got an engine from a junkyard that they said had around 70-80k miles on it. I didn't get the VIN until I picked it up and CarFax said it was from a '92
C2500 that was salvaged in '04 with 226k miles. I called the yard and ragged on the guy because of this and he said his records say it had the lower mileage and I should check the compression. So I checked the pressures and all the cylinders were 180-190 except #7 was 160, a little low, but within the 20% for a rebuild border but then again 180-190 seems a little high for a 9.1:1 compression, unless these a lot of carbon in the heads. I then looked closer at the report and it has a note that a "Not Actual Mileage Title Issued", I also noticed that in '94 it had 140k miles. That's a awful lot of miles for 2 years, and if you subtract the 226 from 140 you get about 86k over 10 years which is 8.8k a year and over 12 years that about 103k miles. The 140k in '94 baffled me so I dropped the cash and got an AutoCheck on the VIN, it didn't even say that it was salvaged and that it had 37k in '94 and 198k in 2001, that's 28k a year. Anyway the casing number on the block 10054727 is standard for a '92 truck but I can't find an info on the ID number on the front below the passenger head, it's K0317FBC.
I the yard guy lying, or does he have info that I don't about the vehicle? Anybody have a clue? Any more info you need? Any good sites that have info on late model truck engine ID numbers? Anything I can do to try to figure out the approximate mileage? After doing the report from AutoCheck I really don't trust these reports much anymore, so I'm baffled.
Thanks for any help,
GlenBA
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it's got atleast 228,000 miles on it Its probably OK to re-ring and a do a valve job on. It'll run another 200,000 miles without a hitch

on
a '92

ragged
mileage
9.1:1
closer
I also

years,
baffled
that's
below
figure
really
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