hello i have a new gm 350 crate motor,its running an edelbrock 600 carb, pertronix dist. msd 6al ign box, power plus intake and it pops out the exhaust on deceleration ,not so much on smooth pedal let off, but very much so on quick let off any help would be apprecited  

It sounds like it's too lean on the idle. Try turning the idle mixture screws out a little. Go a little at a time, say 1/8 to 1/4 turn at a time. Then try it to see what it does. They are the two screws at the front of the carb.