Think how quickly you will be able to change it in the future with all this practice!:poke::)
As for pressure in the block. IMHO if you did not even have a PCV the crank case should not build pressure if the valve cover breathers are open to the atmosphere. If it does have enough blowby greater than the amount of air that can pass through the breathers openings you have a major ring sealing issue.
You stated you have a NEW crank. so I would be measuring the crank to be sure the dimensions are correct to the stock crank.
We are all assuming you have installed the seal correctly with appropriate lube and sealer in the appropriate places.
