head gasket fubared?

[barkster1971]

Hi,
I feel i might already know the answer but... On starting I'm getting A LOT of white smoke from the exhaust and so much soot is coming out of the exhaust it's leaving a 2 foot black skid mark on my drive.
It's driving ok and doesn't feel lethargic. I've added an NPR intercooler and 240 inlet manifold to my 1984 td 760.
I guess it's on the original crappy head gasket as it's only done 87k.
Cheers, Carl.