First Guess:
Not one horsepower more than a PROPERLY-FUNCTIONING stock distributor, coil, module, and plug wires. Potentially lower durability and less service life due to DUI selling Chinese parts that may not meet GM durability specs even though they probably claim that they do. I'll grant that DUI has a better reputation than most aftermarket ignition suppliers--but that's not saying much.
The computer controls the spark timing; no power gain from the module. The OEM coil has more than enough power in reserve--no power gain from the aftermarket coil. The TBI distributors have a known problem with the magnet; and any distributor can have worn bushings. Potential gain from the new distributor simply because it's not worn-out. A non-worn-out OEM distributor would be just as good. Of course, plugs and plug wires, cap 'n' rotor are "consumable" items.
Any improvement comes from replacing defective items in the ignition system--partially-fouled plugs, high-resistance wires, partially-shorted ignition coil, broken magnet on distributor shaft, etc.
If you'd just replace the failed components with good, stock stuff, you'd have the same performance as this--without the crazy price tag.
You wasted a lot of money on "eye candy" aftermarket parts. But some folks really like "eye candy".
The bloom faded from the MSD rose when I figured out that my MSD distributor cap for TBI was just a cheap Chinese cap in an MSD blister-pack. Nobody--absolutely NOBODY goes to China to improve quality.
Companies source from China to improve profit margins.
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