Tuning with A/F meter

[randlej]

Thank you. Couple of replies and questions:

1) I am using the Innovate exhaust clamp so the probe is about 8" into the sidepipe. I was planning to have the bung welded into the collector just before the baffle area to see if it varied at all. Right now, readings are very close to the dyno A/F readings I had done recently and the probe was well into the sidepipes then.

2) The carb is a stock holley so it came with the PV in the secondaries. Forgive my ignorance, but I thought blocking the secondary PV was more for the drag strip usage. Also, it has the stock bleed orifices so to change those would require drilling/adapting.

3) My cruise figures were based on about 2,300 to 2,800 light cruise. I'll fiddle with the mixture screws and see if I can lean it out some.

Questions:
1) What is the ideal advance curve on the spark advance? I have it all in at about 2,800. 16 initial, 35 total, and a vacuum canister set to bring idle timing to about 20 and it at full vacuum adds around 8 degrees. Car seems to like it but I'm sure it could be tweaked some.

2) Probe extender w/ brake line. Are you talking about just extending the venturi effect tube in further? or somehow getting the 02 sensor itself in further?

3) Doesn't appear in the replies that I should be changing the jets but more with PV orifice changes. Yes?