My 318 burns very rich, need your advice.

First, if you saw raw fuel running out the exhaust, you'd have destryoed the engine by now. What you see as noted is condensation carrying carbon in it. Not a big deal. Second, every carb, new, old, expensive, cheap, all have to be tuned to properly run on your individual car. Seom say they were perfect right out of the box... But I'd venture to say they dont know how good a well tuned carb can be and they think it's fine when it could be better. You Edelbrock probably needs step up springs and possibly a rod change. Just get the strip kit and tune it.