Chasing major gremlin, hope this fixes it!

RockinRobin said

That's about the only thing I haven't replaced. Several calls to MSD and they are certain is isn't their 6Hemi controller. Come to think of it, I haven't replaced the ignition wiring harness either, but if they fire fine upto 7500rpm under light load I don't see how that could be it.

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My 6al failure, car wouldnt miss in the water box, or even in first gear. Just from like 6k in second till i shifted it at 7 into high gear, then in the topof high gear too. Just when a real load was on it.
Popped enough to where it knocked about 4tenths out of the car.
Chased carb, plug, heat soak, fuel delivery issues before swapping out the box and problem never came back after that. I raced points with that car so it was raced most weeks
MSD always says nothng is wrong..... lol