Thank you! I thought I knew a lot after my 67 mustang, but I went farther with this car. I just put the motor back in it. I decided to pull it again and, despite having just replaced the bearings, bore it 30 over, find a different cam, and go through the original 74 heads that I had swapped out a few years back. Now I have an unknown rattle. Why can't anything ever be simple?