I'm still having an issue with engine run-on after shutting the ignition off. This is an issue that started last year and I think we discussed this a while back, but I'm still trying to diagnose the problem. Weather my electric fan is running or not after killing the ignition, I still get run-on. With the car idling at 800 RPM with the vacuum connected the timing is at 12 degrees BTDC. I'm running dual Edlebrock 500 CFM carbs and a Comp Cam with a .489 lift. I believe the lobe centers are 108, but I can't seem to find my cam card. Without having access to a dyno, I'm really hesitant to mess with the fuel mixture. Metering Rods and Jets were initally set-up on a dyno by a factory trained Edelbrock tech and the car ran GREAT for years without this issue. Anyway, not sure where to go next with this. Any other ideas? 

  Ron Lane,  Meridian, ID