What year model ?

[wellgraf]

Is there anyone that can figure out what Size, Brand and Year Model my engine is ?

Is this a 215 cui / 3500 cc or what ?
Is it a Rover or a Buick motor ?
From what year is it ?

Engine number is:  THT 51 65 99 and H9 65 20

Sincerely
BJORN WELLGRAF in old SWEDEN
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[ex-tyke]

Doesn't appear to be a BOP engine
http://www.britishv8.org/articles/gm-215-engine-identification.htm