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I see your question has gone some time unanswered so I will assist you. If you ran antifreeze through the flush port and it began running out the back through the exhaust, that tells us the water has been flushed out and replaced with the antifreeze. I would also suggest you remove the spark plugs and spray fogging oil in the holes in the cylinder head, crank the engine over for a couple seconds to get the oil spread throughout the engine. I would also suggest you add fuel stabilizer to the tank to keep the fuel fresh. Also, spray some light oil in all of the pivot points and cables to prevent corrosion.
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