Yep. Typical swap article...change 30 things, and see a gain, but no idea what was the largest contributor to the gains because there was no comparative test between each mod.
They mention the advance mechanisms weren't working, thats a huge difference. Bad advance mechanisms/bad timing curve is going to hurt power whether you have 1 million volts going to the plugs or 30,000.
IMO that 1.5MPG IS a big difference, so I'm not sure what they are a talking about there, but in any case, they had actual physical problems that weren't cured by changing elecronic components.