Hey Everyone, I am trying to tune my SBC 410 and having some idle problems. It is running rich at idle. I have the initial timing set to 15 degrees. I am running a Holley street avenger 770. I have a power valve block off plug in it just to rule out the power valve leaking. The idle mixtures will only respond when they are all 4 all the way in it will kill the motor. The motor will run with only one of them out about 1/4 of a turn. Is this normal or am I getting fuel from somewhere else? Any ideas where I could be getting fuel from?