Head Gasket,Cracked head or hole in piston

G/Day fellas from Oz

As my shop where I have my engine work is closed for two weeks for the holidays
I have a question which some on may be able to help with.

I was racing the other night when lifting off just after the line I lost all power and had to get towed back to the pits (embarssing)

I had spark and fuel but the engine would not fire (la 360) two hours later
got it fired up and drove home ,approx 40mins with a slight miss getting worse as I got close to home.Car still starts and runs fine albeit on 6/7 cylinders ,now for the question.

I have compression in all pots
It is pushing out excessive mix of smoke and fumes from the head area through the rocker vents actually like a kettle.
rocker covers are off and all rocker gear is ok ie valvestems,rockers,springs etc.
There is not a smoke issue through the exhaust pipes.

My theory is one of the following which may or may not add up to the compression test results.

Head Gasket,Cracked head or hole in piston?

thoughts?

Cheers

Benton