I'm on my third Holley trying to fix a problem of getting way to much gas into the engine. I've had three mechanics work on the engine but within weeks the problem returns. I got the engine with a 750 cfm on it. The first mechanics advice was to replace the high rise manifold with a low profile torker, replace the card with a Holley 390 and upgrade the ignition system. After the problem returned the next mechanic adjusted the float. After days the problem came back. The next mechanic said the card was WAY TO SMALL and I needed one around 650. So third card Holley 650 is on and a week later the problem is back. I cranked the mixture down to where the thing barely runs and it still floods the engine.
After reading the other posts ... it really the Holley Carbs? I have to admit the engine backfires when the flooding gets bad, through the card and exhaust after turning it off.
The engine is a 73 327 w/ good intake, headers and a high output ignition system. I'm about ready to give up and get a crate fuel injected engine even if it causes a divorce.... Ideas?