This is interesting. I get to hits on the casting numbers
first - 1957-66 283, 220 hp, 2 bolt mains. Car-Truck
Second - 1964-68 283, 195-220 hp, 2 bolt mains, car-truck
The vin number you have is that off the pad on the block in front of the right head? I am coming up blank with that number. It should start with letters
The date is Feb, 18 1965