340 motor pumping excess oil on right side

Hi all looking for some expert advice on my 1969 340 motor pumping excess oil on right side , if I run a breather cap and tube to air cleaner port ( holley 750 dp) on 7576 air gap intake , it sucks the oil and fouls plugs to a no start situation , please note the valve covers do have a baffles at breather ports ,does not burn oil blow blue is strong and runs fine if I just cap it with non breather its fine or a mesh breather it will sometime dribble out as well any thoughts ? appreciated thnx