OK look at the full thread, got confused with the 273 motor burning oil.
Are you just running the motor while parked? The rings need a heavy load to help seal them. Yes the cylinders should have been hone.
On speedtalk I seen old school guys talk about using boni-am or comet to seal rings, ha ha. You use a table spoon down the carb while the engine is running! Does it work, most times nope but the theory is the girt hones the cylinders and seats the rings.
Pull that pcv valve valve off first!