My odometer isn't exactly correct, but it is within 5 mph @ 70mph.

My wife followed me yesterday to the car show that was about 40 miles south of town. When I was going 70mph by my speedometer, we were actually going about 65. So, I used her car to determine the total miles traveled (since we mirrored) but used the total gallons consumed from my car.

Still 10 MPG.

Now, I've taken the odometer out of the equation. Next!

The ignition is a Mallory Unilite system.

I will take a vacuum gauge and get a reading of the total vacuum at 2500 rpm from the ported side of the carb (where it is hooked up now). After that, I will reset the timing back to 9 degrees, and get another reading on the vacuum.

The 3rd gear suggestion is good, but I don't think it's necessary. This car sucks gas just driving from light to light, not even getting on the highway. Plus, For the last 6 month I drove it without a working 4th gear lockup, so my RPM's in 4th were higher than normal due to lockup not working.

I still suspect the carb. I still get black exhaust soot on my paint on the back of the car below the rear bumper after a full tank of city driving.

I would love to just slap on another carb, but I can't without a lot of work. The throttle linkage, return springs, and TV cable/bracket have all been custom made for THIS carb. I would need another exact 7043282 Q-Jet to try again. I would love to try this.