help with webers!

[wtenukl]

Hi gang,

I just installed some weber 48 IDA's on my 390FE. They have the 10 degree slant for hood clearance. Needless to say, I'm having trouble with them. The carbs are backfiring once in a while, but changing the jetting doesn't seem to help. I'm afraid my cam is not compatable. Here are the specs:
Comp cam 292H
Duration in 292 @ .50 Exhaust 292 @ .50
244
lift is .560
110 degree lobe seperation
Is this too much cam?

Also, when the engine is off, there seems to be some leaking of gas inside the carbs. I can look in the stacks and sometimes see a puddle of gas sitting on the butterflies. Then, the gas seeps onto the manifold by way of the carburator shaft. Is there any way to stop this?

What should my jetting be? Right now the engine runs best on jets sized at .130.

The enging is bored and stroked to 431cu. It has Edelbrock aluminum heads.

Is there an easy solution to these issues, or should I just go back to my dual quad's?

Thanks..

Todd