Re: making a short story long...
It sure sounds like a worn / slack timing chain to me .Here's a quick 5 minute check to see whats really going on .
https://www.youtube.com/watch?v=Aso_RXTHEB4
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1967 Factory short bed - Old school
'71 - 350 / 4bolt / 487 heads / Edelbrock C3BX
Muncie M-22 4 speed / Hurst Comp plus
Factory 12 bolt posi 3.73 / 255-70-15
Smoothed firewall / Factory cowl induction
Power disc brakes / power steering / 3.5-5" drop
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