1986 Toyota Pickup Is white exhaust after a rebuild normal?

Engine Performance problem
1986 Toyota Pickup Two Wheel Drive Automatic 187000 miles

I finally finished puting the engine back together on my 1986 Toyota pickup (22R 4cyl carb engine) after overheating from a bad water pump caused the head gasket to blow and the head to crack (although very slightly) I replaced the head with a used one that was not cracked. I primed it, started it, and it started up and runs smoothly, purrs like a kitten, but there is white steam coming out the tail pipe. Now the engine has been sitting for about a month since I put the cylinders back in, and for 3 weeks since I put the new head gasket on. I was very careful to put all the various gaskets on with sealant (except on the exhaust manifold related things that said not to use sealant). I torqued everything in steps from center outward, to specified torques.

The only thing I was uncomfortable with was puting on a.020" head shim to raise the head back closer to the pre-shaved thickness. It went between the block and new head gasket with copper spray sealant on the block side of the shim, then the head gasket, then the head; no sealant on the head gasket except at the timing chain/block joints.

So how could water be getting into the cylinders?

Is it possible that because the engine sat for so long in the damp bay area night air that there was enough internal condensation in the cylinders or in the exhaust pipe or catalytic converter to cause 3 to 5 minutes or more of white steamy exhaust?

I torqued the head to the specified ft lbs. Is it possible it needs to be torqued down more than the specified amount? I know you're supposed to torque the head bolts again after the engine gets to normal operating temperature.

I rehoned the cylinders, put in new piston rings, new timing chain and sprockets, had the head checked for cracks and shaved, put on a new water pump, oil pump, new radiator, new thermostat, new radiator hoses. Checked all the gas and vacuum lines for cracks before putting them back on. Is there ANYthing besides the new head gasket not sealing. That could cause this white exhaust. I only ran the engine for about 5 minutes, then turned it off as the steam/white smoke increased.