Do a few simple tests first to judge "blow by". Could be your engine is fine and the PCV is plugged. Unlikely, but why jump to conclusions.

With oil fill cap on, remove PCV tube and see how much it puffs out (catch oil w/ rag). If not much, the engine is fine. Even a new engine will have a slight puffing from that small hole. Then test oil fill opening. Try "cap jiggle" test, or puffing w/ hole open. Videos on youtube to judge.