have you pulled the plugs? Are you sure the sensor is right? I've only used one an el-cheapo unit I ran on my S/C'd 440 all it had was red yellow and green lights on it. Is it rich all the way thru the power band? what air cleaner do you have on it? You'd better have a 3" K&N style or better. The factory unit will choke that engine. Try running it w/ just the base plate. I'll bet your "rich" condition goes away. You also need to get your timing right. Buy a good light and set it for 18* initial and 38* total in full at 2200. As far as the "snake" You are compairing apples to onions. I bet the S/C set-up cost more than your entire engine....I know it cost more than mine. Your car should be easy into the mid 10's once you are done.