pontiac street rod

I have a tech question about a motor i built. It is a pontiac 400 bored 030 over keith black single eyebrow pistons, eagle h rods, comp cam magnum .480 lift cam, comp cam roller rockers, 670 heads w/mild port work, edelbrock performer rpm intake, holley 770 street avenger carb. The problem i have is when i attach the pcv valve to the carb pcv port , the car burns oil like crazy. So I thought maybe i was getting blow by because the rings are'nt seated yet. Did a compression check and all was fine. I then welded a short nipple on the underneith of the air cleaner plate and attached the pcv hose there. Now i get oil blow by out the rear crank seal due to high crankcase pressure. The engine now has about 1500 miles on it with no change. Iam at a loss and would appreciate any info you may have.

hi. i didn't see anything stated about what kind of valve covers you have on your motor? sounds like you have the wrong covers or the baffels are missing under the pcv valve.(change the covers and see if that helps any. i would try the stock covers first as long as you have the clearance for your rockers etc. good luck