It was really smoky, I took the head off as it was suggested that the head gasket had gone. I sat the valves, changed valve stem seals, and it is much better, but lots of heavy breathing and still a bit smoky..More than acceptable.
Only driven about ten miles, made a few noises, power went flat and now us sounds like a VW beetle... I'm going to check valve gaps, push rods...If that's fine it may be a bent valve, plus it needs rings..
So it's decision time...