That is a pesky noise for sure. Doesn't sound like valve train to me . Taking the engine out is a big job, so I would recommend eliminating EVERYTHING else before doing all that work. Eliminate the fuel pump as mentioned in other posts. Then remove one V-belt at a time to eliminate each accessory. Finally, unbolt the torque converter, move it back. After each individual test, if the noise is still present, the engine will unfortunately have to come out. Lets hope for the best.
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