The casting number 3970010 indicates a 1969-1970 350 cubic inch Chevrolet small-block engine. The "V0815TJA" is a partial vehicle identification number (VIN) stamped on the engine block, which is *not* directly used to determine the year. The engine could have been installed in a car manufactured in either of those years, or even later if it was a replacement engine.
Therefore, based solely on the casting number, the engine block was cast in 1969 or 1970.
