Hi Tommy, I understand you are Nunzi's son. I had the extreme pleasure of working with your father on my 400 motor for my 1970 TA. He's amazing and hope he is well. I had posted a question on the forum and someone suggested I reach out to you. I had a question of which valve seals were used on my motor. I have this lingering thought that your dad made some modification to put the new style Chevy o ring seals on my valves. Do you have any idea or could you ask him? Thank you!