Same Big Block Question, Same Big Block Problem!

[savatreatabvr]

I've asked questions about why my mid 70's C20 454 has no power many times on this forum and I've gotten great answers and advise but nothing really seems to help much. If you click on the attached video you'll see my truck running with a vacuum gauge hooked to it, as far as I can tell the vacuum gauge is showing my truck is running pretty good! Ok I can live with that but why is it still lacking power? Shouldn't the gauge be reading low vacuum or be unstable or something if there's no power?



Sorry about the video quality, it was taken with my cell phone.