350 sticking lifter......cant find it

Im pretty sure its a stuck lifter. has the sewing machine sound and gets louder with rpm changes.

changing the oil did nothing. engine cleaner did nothing.

i used a tall screwdriver to hear harmonics all over both valve covers and all intake runners. Ive been able to pinpoint these before but cant find this one.

pretty sure its not a rod knocking.

ive checked all over the motor just to see if i can find it.