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what symptoms do you have? older bbc engines like to eat timing chains and cam lobes assuming both parts are stock I haven't seen one with worn springs not to say its not possible. is there any ticking? if you pull the valve covers off are any of the rocker arm nuts screwed down further then the other ones? if you have a friend crank over the engine pull dizzy power wire see if the rocker arms have the same amount of movement up and down. other then that may want to have a shop check and or rebuild the heads.
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1976 Custom Deluxe SWB Med FMB.3/4 Drop.
Gen VI 454, Muncie HD 3 speed With Modified OE Hurst Shifter, 3.73 12 bolt, GMPP HO roller cam, Hooker headers, Performer intake with modified Q-jet, Accel distributor. Best 1/4 12.3 @108. Funnest run 19.84 @88 full 1/4 mile burn out.
1997 K1500 ext cab 5.7 stock except muffler
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