408 breaking up

I do not have the faith that they test every engine. I think they build one, tune it, get the numbers, and run in the clones after. The 106 number means it's way down on power. It should pull clean to about 5500 where the carb is out of steam. So, if the ignition is stable and the voltages at the coil are good, Try to borrow a larger carb and go race again. at least an 850 4150 series, an HP 950 or Avenger 870 if possible.