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Replacing the wires is a pain in the first place.
Sounds like you are not getting the amount of spark you need for clean detonation. If you didn't change plugs do it. and don't use the split fire or platunum plugs just the good ol' autolites. I have had a lot of trouble with the "better plug" also look for a boot not all the way on the plug. you can hear a clicking noise there is arcing in the boot, this will degrade power. also turn the lights off in the garage (at night) and see if you see any sparks jumping around. Look at the connection point of the wires. are there any carbon traces...Black lines. if so get some electrical contact cleaner and clean those off. any excess dirt on the distribution block will cause arcing. that is what it sounds like to me. due to the lack of power at speed.
Hope this helps
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