Did they make a 305 with 4 bolt mains? It decodes as a 305 (asked in Tag Team section). We know it's a 4 bolt block as we put a new pan gasket in it. I was told to look for casting date. Where is that and would that change the result?
We still can't believe that this motor is a 305!! Torque to burn!! Previous owner said he built the motor, and said it was a 350. Might have got scammed I guess.
I don't think there was a 4 bolt 305 but I'm not sure about that. Somebody may have built it with 4 bolt mains. Find out where the motor came from (previous owner) and ask them about it. Someone should know the answer.