Quote:
It went 124mph at 10.84...
The Wallace Racing calculator says 124 mph at 3480 lbs is 531 flywheel horsepower. ET is 540 hp
Both ET AND MPH are way way down. Just a high side ignition miss wont bring back that much missing ET. ET is all made up in the eigth mile. Who specd the cam, and what are all the numbers on the head CFM, just not the "big" number?
In my case a MSD " high speed miss" in top half of second, and high gear, did knock out a ton of steam. From 10.50's when it would " act up" to. 9.90's when it ran normally.
Ultimately it started doing it every pass, and I finally swapped it out and fixed the problem(6al box).
If the OP is dealing with the same issue, the ET swing would put his car near where it should run.
My issue was extremely similar..... Box is pretty easy to swap to rule out. Especially if it happens to be an older 6al 
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8
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