Crankcase pressure

Just wanted to say hello to everyone on this board. This is my first post. Ok, I have a 71 Duster with a 360 in it. It seems to build up a lot of pressure in the crankcase. I have a PCV valve on one side and a breather on the other valve cove. What happens when I run the car at the track is I get a lot of oil coming from the breather and PCV. It spray a long the valve covers. I have a 750 DP carb, Mopar single plain intake, 533 lift cam Eddy heads, TTI headers, Harland Sharp rockers. Full MSD ignition, Steel crank, rods and pistons from Mopar. The rebuild is not old. I have heard with a high lift cam the engine is not making much vacuum. Should I put a vacuum pump or evac systems on the headers? I just had to replace the oil pan gasket because I think it blew because of this problem. I don't know for sure. My be this has happened to someone else? :silent: