Urgent help needed

CHEATHAM said

it would be a good idea to prime the motor like you said it will pump the lifters up and you may need to recheck the lash or lifter preload.

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I primed my motor only to have the same symptoms not go away. A friend of mine (a Chevy guy of all people!) said to prime the motor in steps, clicking the motor over several times. This allows the oil to travel thru the passages since they're not all open with the cam and crank sitting in one spot, the oil holes in the crank and cam have to line up with the oil passages in the bearings.
Once I did this, I regained my lash, problem solved. Click your engine crank two revolutions (720 degrees), stopping maybe 10-12 times from start to finish to prime your motor. You should get full oil circulation and be able to loosen your lifters.