Hi I have a 68 fastback 289 that is stock internals maybe a small cam. I am getting around 8mpg around town and it has a flat spot in the throttle around 15-1700 rpm. It also doesn’t pull very hard and sounds like it’s not running smooth. The timing is dead on and everything else is great. I was wondering what metering rods and springs everyone’s running. I know the 600 is a little big but I got it for 40% off so I couldn’t pass. Also any tips on what size jets to put in would be great.