You might remove the valve covers, clean the inside with lacquer thinner, find some scrap alum, make a plate to fit between the two valves on the head, but allow room for the breather to breath, and use JB Weld to glue the plate into the cover to use as a baffle for the oil breather. This might help with the oil coming out of the breathers.
If not, then the rings may need to be seated by driving the car, in high gear only, from 20 to 50 mph at WOT, coast to 20, then back into WOT. Do this for about 10-12 times, change oil and filter.
Sounds about correct for 10 quarts of oil. You might want to get another dipstick, pour in 5 or 6 qts, fill the oil filter, and make a new dipstick to register the new LOW level, then pour in the last quart, and make a new FULL level.