Gen III / A body...high 10's / low 11's...street strip car. Anyone?

my ignition ( msd6 ) is cutting at 6100 or something... thought first it is the fuel delivery or carb but it makes the same noise like a Turbo Honda into the limiter... strange. I have the same gears like you, but Manual shifter and 26" m/t tires... and been sticking at 12.97 sec @ 110 :(