I have been having a problem with my carb runing rich. 780 holley vac secondaries. I have taken it apart and put it back together several times. New gaskets , new jets, new power valve, new gaskets under carb, just can't stop it from runing rich. I look down the carb while its runing and don't see a flood going on. Pull the plugs after a few miles and they are black. Any suggestions. On a liter not I was talking to my wife about it and she said with a stright face "Run cheaper gas" I about choked.