307 olds knock?

i was wondering if i have to rebuild..i know the rockers and timing is ticking but around 0:29 into the video you hear the knock when the car accelerates...the car has 500,000 miles so i was thinking if i should just get a new engine or rebuild...ooh and plz no bullshit comments. this video is for info only not for showing off..---- I JUNKED THIS CAR---

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