1969 camaro ss 396 375 documentation question

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recently aqquired a 69 camaro ss x66 code norwood from an onwer who has had the car since the early 70's he got the car with no engine , car has #'s matching muncie , 12 bolt 410 , he put a small block in the car as long as hes had it, it has a deep groove p/s on which only would come on a 375 car .I know its a 375 car, just trying to any other things to look for.