Spraying Oil

My 383 bored and stroked to 496 was pushing oil out by the grommet of the valve cover breather when I drag raced. Both lines from these breathers were plumbed into the back of the carb. I installed a catch can with a filter and plugged the carb inlet. Started car and while idling in the driveway, it was spraying oil out of the dipstick tube (with the dipstick all the way in) What gives??