Slant 6 Vibration

SOOOOOOO..... I'm now dead in the water. I only had a little time to troubleshoot today. I went out and played with the timing, which with only a little adjustment did seem to help the vibrating some. I took it literally around the block and got home only to find a pinhole had opened up in a freeze plug, half of which is obscured behind the exhaust manifold. GO FIGURE. Looks like I'm tearing it all down now :/