I think I have a burnt ring

Well I checked the oil yesterday and it was like barely on the dipstick. Then I got to thinking about my muffler tip being covered in oil on the inside. Then it hit me. I have a fucked up ring. Now I dont know what I should do. I could put my head on my old motor or could rebuild this one. Any thoughts on which would be easier? I know which one is cheaper.

I was told that the motor I put in had new rings but either the guy lied or he fucked them up somehow.

what is your old motor? If same just put head on old motor migt be easier