First plug change.

beanhead said
And check this out. When I'm cruising along and I floor it, trans kicks down and the car rockets on down the road...and the A/F drops to 11.7-12.0 and stays down there. But, from a slow creep or stop if I nail it and go through the gears manually (taking care not to blow the tires off too bad at the bottom end) the gauge runs steady in the 13.7-14 range all the way to pucker-and-lift. What's up with that? Gearing/load related? I figure WOT is WOT as long as things have a chance to stabilize, but the two situations are producing different readouts....
It absolutely hauls balls shifting manually at WOT but the plugs seem to correlate more to the high 13's on the gauge than the 'stomp from a cruise' numbers.

I don’t even have a good guess for this. My WAG (Wild Assed Guess) is without knowing throttle position you may (and by “May” I’m just straight guessing but it’s all I’ve got!) be in a slightly different throttle position, which can affect the 02 reading.

It doesn’t take much of a change in throttle position to change what the carb “sees” as far as load, road speed and such.

I was going to buy an 02 sensor, but I decided to just buy a data logger so I can use a TPS and log and download what’s happening at any road speed, throttle opening, RPM...all that stuff.

Again, that’s my WAG.