lots of smoke, please help.

My 82zx was running bad and i had a huge exhaust leak around the manifold so i decided to tear it all down and put it together right so i tore took my manifolds off and while i had everything apart i took the head off to look at the pistons and put a new head gasket on, i thought mine old one was leaking some coolant, also i had a p90head i wanted to put on. I put it all back together and start it up and immediately it starts smoking, well i thought this would just be some crap burning off the new head but it kept on smoking, really bad, it spewes out white smoke so thick that it trails three or four houses down, Never in my life have i seen a car smoke this bad. The head was good when i took it off the old engine, it had just been rebuilt ( then friend wrecked car) After a while of checking and searching i found that i had forgot to hook up the pvc valve hose, but when i reconnected it it stil smoked. any help would be great i really want to get her fixed.
Blake