This all depends if the oil is passing through your piston rings or your valve seals. It's either one or the other if you are burning oil with your combustion. I would do a cylinder leakage test to see whether if its the valve seals or the rings that failed before going and rip things apart/ordering any parts. Who knows until you get the leakdown done, what if it's only the valve seals, then you would only have to pull the head and deal with that....much easier imo.