Engine Knocking, On Acceleration Options

[Remy]

Hey all, My car just started having this weird knocking on acceleration problem, I'm not sure where exactly its coming from but its somewhere in the engine bay. It'll knock on acceleration then disappear, I don't know if its the lifters or broken springs or what I will be changing my oil next week prob won't do anything but I plan on replacing the head gasket this summer. I just wanted to know if it'll be better to get a rebuild cylinder head, used cylinder head, or would it be better to rebuild my old one instead ?? Thanks