well first off the setup is 350, bored .030 over, performer rpm intake, 2.02 heads, mild comp cam 224/ 230 @ .050", 650 edelbrock thunderseries carb, msd 6al ignition, msd pro bil distributor with blaster 2 coil. The problem I am having is that when I mash on it, the car hesitates/stalls till it gets a little above 2k then takes off like a bat out of hell. Im runnin 12 initial timing and 36 total. I recently took off my flow master cross over muffler and replaced it with 2 forty series and notice that the hesitation grew a bit worse and I feel like im not getting the same kick when I open up the secondaries cruisin around 30-40. so I figured it was runnin too lean, checked the 3 6 2 4 plugs and they were white tipped. so I started playing with the idle mixture and noticed when I richened it and revved it i would either get a loud pop or full back fire through the carb. Any thoughts to help me out would be great, could it be the springs on my rods or the rods them self? I have checked the floats on the carb as well as the seats/needle. Floats were a little off so corrected it, not the problem, Choke does open fully when car is warmed.