Duece,
I will check my 6299 carb.
Here is a tip if using a WBO2 sensor/ gauge. No engine runs perfect at stoich fuel mixture( 14.7 to 1). My engine has been using a WBO2 since going turbo and EFI. By no means does my engine run best for idle/ cruise even near 14 to 1 fuel mixture. And full boost requires much higher mixture. The WBO2 will be a quick and easy way of taking reference readings, Once the correct mixture is found for a certain RPM/ load the you will be able to reference that.
For instance:
Gm says to set idle timing at 8 degrees but Jimw found that 12 degrees worked best for him.
Books say cruise mixture for a (390) carb should need a 51 main jet, but running it shows that a 53 jet works better. While measuring the mixture with a WBO2 will show possibly a 12.75 mixture. Books say it should be 14.7. Whats up? There are too many factors that can change the desired mixture for your engine. Timing, compression, fuel, combustion chamber, quench to name a few. So each engine will need a different than stoich mixture.
I would suggest using the gauged unit.
