hi i just bought a 350 motor and i want to know some about it...... it is a 4 bolt mains motor because i checked... heres the #'s back flange behind head drivers side cast # 3970010 and 41 GM ...... bck passenger side same location..# L18 8..... front flange in front of head passenger side # V1299800 and the # i found under the valve cover cast into heads is 462624.....If any body has any info i appreciate it like year.. where it was built.. and the application.. and is it a target master engine because it has target master valve covers on it????......and does anyone know anything about the target masters?? where they any good????thanks alot...