Change of oil and found metallic spring etc inside - need your advise.

[Jac Mac]

If you look at all the lifters that are open/ raised you will see that they have bled down to some extent, very hard to be definitive on that one without knowing time it has sat in partial dismantled state.
I stand by my earlier post, this motor needs a rethink on the valve train components, particularly in view of the block chosen as a base, given that I would have to wonder about the rest of the engine combination...but then I dont know anymore than what we have seen here, the oil pressure obviously went west when the lifter jammed up, but if its got a restrictor kit & the lifters in question are at very end of oil circuit that might not be critical, one question, from the original posters comments the car might have been driven some distance with the 'ticking' sound, bet the cam lobe is not too flash on those lifters...