lash adjusters?lifters? need help

i have a 96 cobra. the car has that ticking sound and almost sounds like a sewing machine. its pretty loud and annoying. im just wondering if its the lash adjusters i need to replace or the lifters cuz it dont do it all the time. it alwaya does it at first start-up but even after it warms up it will just start doin it out of nowhere. idk what it is and i would like to figure it out.

if i need to replace anything any help on how to do it would be appreciated. thanks in advance
 
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