Quote Originally Posted by bytes311 View Post
All I did was disconnect the center fuel line from the FD, tilt the bottom towards me, put the new o-ring on, and then screwed the FD back into place. I'll double check the vacuum advance. Thanks Dave.
I pulled out my dwell meter and noticed immediately that the FV wasn't buzzing. I guess replacing the o-ring under the FD fixed an air leak that had gone unnoticed for some time. After re-adjusting the dwell, the engine runs great. I now wonder if that o-ring was the reason why my car always failed smog, even with the dwell reading being within range.