383 tune up advice needed

That is PIG rich at idle is my guess.

Ede carbs are VERY sensitive to fuel pressure. Make sure teh pressure isn't more than about 5-5.5 psi. When the engine is running look at the booster to see if you have raw fuel dripping into your engine

Might require a set of lighter springs on metering rods based on idle vacuum.

Timing FIRST... You'll have to find the spot your engine likes.