318 lifter noise

Update: still hasnt gone away, ill hopefully pull a cover tonight and see whats going on. Its definately drivers side and if you listen under the drivers fender its very apparent. Sounds like an exhaust leak but i'm almost positive it isnt, drivers manifold and donut gasket are good.

I hate to say it but it almost sounds like its coming from the bottom end. Hard to pin point with the belts and all going but its much easier to hear from under that fender...