Do the compression test. Sometimes a head gasket failure isn't just between the cylinder walls on the block, sometimes it is an un-level deck/head, so it will still be useful to run the test.. don't ask for advice, then sit there and tell people to fuck off. you stubborn piece of shit. The pcv box is irrelevant in your quest. there are like 6 coolant lines"
-upper rad hose
-lower rad hose
-from block to heater core
-from heater core to block
-from block to hot side of intake manifold sensor
-from cold side of intake manifold sensor to block
other than that, check the o-rings on the water pipe, and replace the water pump and the seal. clean the mating surface well. Might as well run a pressure test on the radiator itself as well, rent the kit from advance. push the pressure up to 20/25 psi and look for leaks on a level surface. if you need help, pm me, but if you choose to ignore my advice, don't be a stupid ignorant piece of shit and tell me. I don't care.
Good luck.