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No other changes are necessary. Just be sure the fuel system is clean, and also be sure the copper tubes the injectors fit into are clean where the bottom tapered end of the injector fits. There can be carbon there that needs cleaned out before putting in a new injector. When you are ready to...

In reference to the gentleman with the John Deere with a 2-53, your hard starting problems are not caused by the exhaust valves as there was only one size. However there were early engines built with 2 larger valves and later engines with 4 smaller valves which gave better performance. However...

Pull off the valve cover and look at the little disc on the injector heads. There will be a letter and number there. The older series injectors like the "S" series had low pop pressure, causing hard cold starting and smoke. Try to go to "N" series injectors, which pop at a much higher pressure...