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How would you still have coolant in the exhaust manifolds? You typically remove the manifolds if the heads were sent to the machine shop for valve and machine work. You will typically get coolant spillage into the cylinders which you should remove with towels or a wet vac. The residual coolant that remains in the ring lands will cause a bit of initial smoke on startup but it clears up immediately.

Check your oil for antifreeze contamination. The obvious culprits are intake or head gasket leaks.