Ok guys, 175" WB FED, 410 SBC timing around 36 degrees, MSD Pro-Billet Dist, MSD Blaster 2 coil, MSD 6 ignition box, MSD starter saver, and MSD 2 step rev control. Engine is fuel injected on Alcohol (down nozzles), Kinsler 450 mechanical pump.
The car on launch runs flat and breaks up. Our first pass of the day our 60' times were 1.415ish and our normal 60' times are roughly 1.16ish. It is flat then all of a sudden will pick up and our MPH on top end is normal 166MPH.
We tried leaning the barrel valve, then we tried richening the barrel valve, nothing made a difference. And by the end of the day the engine would clean out until I hit high gear (powerglide) and then it would break up again.
I'm pretty certain this is ignition, but where or what part of the ignition should I be looking at? Our tach is the digital shift light with the tach built in, and it seems very erratic as well....