I can only speak from personal experience. I've owned my car for over 20 years and had ignition problems for most of those years and experimented with every option.
In 2000 I switched to an all MSD package that has NEVER failed or caused any trouble at all since the day I installed it.
All I've done since is change plugs. Actually, I really only have to clean the plugs but I change them for once every year or two for no good reason.
Here's what I have and swear by:
MSD #8577 Magnetic Pick-up Distributor
MSD #8203 Blaster Coil
MSD #8920 Ford Tach Adapter
MSD #3119 8MM Silicone Spark Plug Wire Set
MSD #8581 Bronze Distributor Gear
MSD #6420 6AL Ignition Box with Rev Limiter
MSD #8746 RPM Module Kit 6000 - 6800
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