[Foghorn]

I have the O2 sensor in a bung welded into the collector. The sidepipes I am using are the Kirkham's SS versions. TK tells me that I will see some variance in the AFR reading due to the slip-fits leaking, however, I have not been able to verify any leaking (holding a lit cigarette next the the pipes while the engine is running at idle/various RPMs, I would expect to see the smoke of the cigarette effected in some manner).

My vacuum at idle is 8-10" at idle (it has been awhile since I drove it with the vacuum gauge hooked up, but I do remember that the PV choice was in line with the conventional wisdom of 2" less than idle vacuum), up into the teens at cruise.

The engine jumps to redline (6500) from 4200 twice as fast as it revs from 2000 to 4000, hence "coming up on the pipe" - very hard to keep a handle on it, especially in traffic.

What do you look for in a damaged center electrode? I am also using the MSD distributor (mechanical advance only).

The plugs are a dark grey on the outer half of the electrode, moving to black down in the center. Could I have too cold of a heat range plug? I have thought of changing the plugs, just to have a clean slate to base any further adjustments. When I first started the engine, it was much richer than it is now, so much of that soot could be "old data".