Something is going on for you to have that much blow by. I have the same bore/stroke combination and I have no blow by, none. I am running stock valve covers with a stock push on breather on the driver side and a pvc valve in the passenger side. Can you use stock valve covers?
I can not use stock valve covers. These are Indy 426-1 Legend Aluminum Heads. Stock valve covers won't work. On a side note, what carburetors are you using?
