Just as a matter of interest, I've recently hopefully solved a couple of issues in 2 different cars we have. 1 was the ign switch on our '68 sb Barracuda, it was so worn vibration would turn the main feed on and off, it pays to check the simple stuff.
The other was a crank trigger on the Challenger, This "went away" slowly getting worse after 6 passes or so. Closing the gap to .035" helped but that's way below MSDs min spec of 0.050 and it seemed reluctant to pull more than 6500 ish rpm. Hoping for good things now it's fixed as it ran a 9.59 @ 141 which is good for the 572 engine.