Engine decoding

[andablo1]

Hello Im trying to find out what engine my 71 c10 has now. I know its not the original engone bc its not chevy orange its a blue engine block. I did a little research but I didnt understand any of it. These are the numbers off my engine Id like to know whare year date this engine is from and how much horse power it has.
GM block #s
Casting Number 3970010
Clock dot on D? Away from v and t
Engine Code location VO228TBD
Flint engine Feb 28
Code Year CID HP BBL Appl
TBD 1970 350 4 convfwd cab, m/t
TBD 1971 350 255 4 conv. & fwd cabs
TBD 1979 350 165 4 conv. Cab,, m/t, fed
Partial vin T9S517763
Years 69-79
CID 302/350
Car & Truck 2 & 4-Bolt Most common

 

[TXK20]

What' up, fellow Texas brother! So far, this is what I've got:

3970010 = '69 302 from Camaro - doesn't match suffix code TBD
'69 327 from truck or industrial app. - doesn't match suffix code TBD
'69-80 350 (no vehicle info listed)

V0228TBD = '70 350 w/ unk hp
'71 350 w/ 255hp
'79 350 w/ 165hp

You should try to grab the Casting date off the deck behind the passenger side head/valve cover (same location as Casting No., but on pass side instead of driver). That will help narrow down the year. For example, if your casting date was L 01 9, which translates to (L is 12th letter corresponding to 12th mo.) December 01, 19X9 - that last "9" means it's the 9th year of the decade, but you have to find the decade (70s, 80s, etc) out from another source, i.e. one of the other block numbers. The suffix code TBD has one option that matches - '79. Find out that casting date, and hopefully it matches one.

 

[Garrison]

@TXK20, you seem to know a bit about engine id. I recently posted a request for help. please respond if you can help. thanks Garrison