Im looking to buy this 95 na with 159k original miles with these compression results

1-180
2-135
3-150
4-175

so from my research and to my understanding neighboring cylinders with low compression like those numbers show is more than likely a head gasket which I could fix myself. Could anyone help to further tell me what could cause these numbers. The car looks to be in near perfect condition which is hard to find in my area for a good price, thats why I'm trying to figure out if its worth it. Any info will be greatly appreciated. I would wait it out and look for a what looks to be a flawless miata but I need a car asap. my daily is having lots of problems.