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I suggest a bit more diagnostic work - IMO it is pretty unusual to have a head gasket go (and I have replaced many) and NOT have the cooling system involved, with coolant entering the cylinder or exhaust gases getting into the coolant. That much oil smoke means that quite a bit of oil is getting into the combustion chamber, so it is either getting past he gasket (which only seals off the oil return channels - or is there a presure feed through the head to the cam journals and spray bar?) or by the rings. Isn't the cooling jacket closer to the combustion chamber, i.e. wouldn't you expect that a leaking gasket would have to leak/consume coolant before the leak would be bad enough to also introduce oil into the combustion chamber? Your symptoms are also consistent with broken rings/lands, which may not be obvious with the head off. A leakdown test might help, but in either event you'd expect to hear escaping pressure into the crankcase, but you might be able to isolate the sound with a stethoscope.
Hopefully it is not broken pistons, but I'd definitely make sure before putting everything back together.
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